Free Christian Curriculum Kindergarten through twelfth grade · free to download

Grade 9 · 15 units · 180 lessons · 1,800 questions

Algebra I

A full year on algebra alone, from variables and integers through quadratics, in 180 daily lessons.

About this course

This is a dedicated Algebra I course that spends the entire year on algebra and nothing else. It opens with the language of algebra — variables, terms, coefficients, order of operations, and the properties of real numbers — then covers integers and rational numbers on the number line, one-step through multi-step equations, equations with variables on both sides, literal equations solved for a chosen variable, and inequalities of every kind including compound and absolute value. Functions come next: domain and range, function notation, the vertical line test, direct variation, rate of change, slope, and the slope-intercept, point-slope, and standard forms of a line, along with parallel and perpendicular slopes, scatter plots and lines of best fit, and word problems on distance, mixture, age, and simple interest. The second half of the year covers systems solved by graphing, substitution, and elimination; exponent rules, scientific notation, and exponential growth and decay; polynomials, FOIL, and special products; a full unit on factoring that runs through grouping, trinomials with a leading coefficient, differences of squares, and the sum and difference of cubes; rational expressions and equations with attention to extraneous solutions; radicals, the Pythagorean theorem, and the distance and midpoint formulas; quadratic functions solved by graphing, square roots, completing the square, and the quadratic formula; and a closing statistics unit with box plots, histograms, correlation, probability, permutations, and combinations.

The course is 180 lessons in 15 units of 12, one lesson per school day at about 55 minutes, which is a full year. A lesson opens with prayer, states the day's idea in a short paragraph, defines the key vocabulary, and moves quickly into three to five fully worked examples with every step shown. A brief real-world application and a KJV verse tied to the day's math follow, along with the same closing notes on study habits and common mistakes that appear in every lesson. The instruction is compact and the worked examples carry most of the teaching, so a student who needs an idea explained several different ways will do better with you sitting nearby than working alone. Every lesson ends with a ten-question multiple-choice quiz that grades itself, and every unit closes with a review lesson. The final unit is cumulative review plus a few application lessons on algebra in science, finance, and geometry. Materials are pencil, graph paper, a Bible, and an optional calculator.

Algebra itself is taught from the ground up, so no prior algebra is needed, but your student does need a settled pre-algebra foundation: confident arithmetic with fractions, decimals, and percents, comfort with negative numbers, and familiarity with exponents, square roots, and the coordinate plane. Freedom Homeschool also offers a general Math course at ninth grade, and the two overlap heavily. That course is an integrated survey — algebra, proof-based geometry, and statistics through z-scores in the same year. This course sets the geometry aside and spends the year on algebra alone, which lets it go considerably deeper on functions, polynomials, factoring, rational expressions, and radicals. Each is a full 180-lesson year on its own, so assigning both would mean two math courses running at once. Most families will pick one: the general Math course for a broad year, or this one for a student who needs a full Algebra I on the transcript before moving on to Geometry.

What the course covers

What your student will be able to do

Scope and sequence

All 15 units of Algebra I for Grade 9, in the order they are taught.

Units in this course, in teaching order
UnitCoversLessonsQuestionsJump to lessons
Unit 1Foundations of Algebra12120Lessons
Unit 2Solving One-Variable Equations12120Lessons
Unit 3Inequalities12120Lessons
Unit 4Relations and Functions12120Lessons
Unit 5Linear Equations and Slope12120Lessons
Unit 6Writing and Applying Linear Equations12120Lessons
Unit 7Systems of Equations12120Lessons
Unit 8Exponents and Scientific Notation12120Lessons
Unit 9Polynomials12120Lessons
Unit 10Factoring Polynomials12120Lessons
Unit 11Rational Expressions and Equations12120Lessons
Unit 12Radical Expressions and Equations12120Lessons
Unit 13Quadratic Functions12120Lessons
Unit 14Data, Statistics, and Probability12120Lessons
Unit 15Comprehensive Review and Applications12120Lessons

Every lesson, by title

All 180 lesson titles are listed here — nothing is withheld until you download. Open a unit to read its contents.

Unit 1: Foundations of Algebra 12 lessons
  1. 1Variables, Expressions, and the Language of Algebra10 q
  2. 2Order of Operations (PEMDAS) — God's Order in Mathematics10 q
  3. 3Real Number Properties: Commutative, Associative, Distributive10 q
  4. 4Evaluating Algebraic Expressions10 q
  5. 5Translating Words into Algebraic Expressions10 q
  6. 6The Number Line and Absolute Value10 q
  7. 7Adding and Subtracting Integers10 q
  8. 8Multiplying and Dividing Integers10 q
  9. 9Rational Numbers on the Number Line10 q
  10. 10Comparing and Ordering Real Numbers10 q
  11. 11Square Roots and Perfect Squares10 q
  12. 12Unit Review: Foundations of Algebra10 q
Unit 2: Solving One-Variable Equations 12 lessons
  1. 1What is an Equation? Balance and Equality10 q
  2. 2Solving One-Step Addition and Subtraction Equations10 q
  3. 3Solving One-Step Multiplication and Division Equations10 q
  4. 4Solving Two-Step Equations10 q
  5. 5Solving Equations with Variables on Both Sides10 q
  6. 6Special Cases: No Solution and Infinitely Many Solutions10 q
  7. 7Solving Equations with Fractions10 q
  8. 8Solving Equations with Decimals10 q
  9. 9Literal Equations — Solving for a Variable10 q
  10. 10Using Equations to Solve Word Problems (Part 1)10 q
  11. 11Using Equations to Solve Word Problems (Part 2)10 q
  12. 12Unit Review: One-Variable Equations10 q
Unit 3: Inequalities 12 lessons
  1. 1Introduction to Inequalities: Greater Than and Less Than10 q
  2. 2Graphing Inequalities on a Number Line10 q
  3. 3Solving One-Step Inequalities10 q
  4. 4Solving Multi-Step Inequalities10 q
  5. 5Compound Inequalities: AND Statements10 q
  6. 6Compound Inequalities: OR Statements10 q
  7. 7Absolute Value Equations10 q
  8. 8Absolute Value Inequalities10 q
  9. 9Inequalities in Word Problems10 q
  10. 10Writing and Solving Inequalities from Real-World Scenarios10 q
  11. 11Checking Solutions to Inequalities10 q
  12. 12Unit Review: Inequalities10 q
Unit 4: Relations and Functions 12 lessons
  1. 1Ordered Pairs and the Coordinate Plane10 q
  2. 2Relations: Domain and Range10 q
  3. 3What is a Function? The Vertical Line Test10 q
  4. 4Function Notation: f(x) and Evaluating Functions10 q
  5. 5Representing Functions: Tables, Graphs, and Equations10 q
  6. 6Linear vs. Non-Linear Functions10 q
  7. 7Arithmetic Sequences as Linear Functions10 q
  8. 8Direct Variation: y = kx10 q
  9. 9Rate of Change and Slope10 q
  10. 10Graphing Linear Functions from a Table10 q
  11. 11Identifying Functions from Real-World Data10 q
  12. 12Unit Review: Relations and Functions10 q
Unit 5: Linear Equations and Slope 12 lessons
  1. 1Slope: Rise Over Run10 q
  2. 2Calculating Slope from Two Points10 q
  3. 3Positive, Negative, Zero, and Undefined Slopes10 q
  4. 4Slope-Intercept Form: y = mx + b10 q
  5. 5Graphing Lines Using Slope-Intercept Form10 q
  6. 6Graphing Lines Using Intercepts (x-intercept and y-intercept)10 q
  7. 7Writing the Equation of a Line from a Graph10 q
  8. 8Writing the Equation of a Line from Two Points10 q
  9. 9Point-Slope Form: y - y1 = m(x - x1)10 q
  10. 10Standard Form of a Linear Equation: Ax + By = C10 q
  11. 11Parallel and Perpendicular Lines10 q
  12. 12Unit Review: Linear Equations and Slope10 q
Unit 6: Writing and Applying Linear Equations 12 lessons
  1. 1Modeling Real-World Data with Linear Equations10 q
  2. 2Scatter Plots and Lines of Best Fit10 q
  3. 3Interpreting Slope and y-Intercept in Context10 q
  4. 4Writing Linear Equations for Word Problems10 q
  5. 5Linear Growth and Decay (Simple Interest, Depreciation)10 q
  6. 6Piecewise Functions and Real-World Step Functions10 q
  7. 7Comparing Linear Models10 q
  8. 8Distance, Rate, and Time Problems10 q
  9. 9Mixture Problems Using Linear Equations10 q
  10. 10Age and Number Problems10 q
  11. 11Geometry Applications of Linear Equations10 q
  12. 12Unit Review: Writing and Applying Linear Equations10 q
Unit 7: Systems of Equations 12 lessons
  1. 1What is a System of Equations?10 q
  2. 2Solving Systems by Graphing10 q
  3. 3Solving Systems by Substitution (Part 1)10 q
  4. 4Solving Systems by Substitution (Part 2)10 q
  5. 5Solving Systems by Elimination (Addition Method)10 q
  6. 6Solving Systems by Elimination (Multiplication Required)10 q
  7. 7Special Systems: No Solution and Infinitely Many Solutions10 q
  8. 8Word Problems Using Systems of Equations (Part 1)10 q
  9. 9Word Problems Using Systems of Equations (Part 2)10 q
  10. 10Systems of Inequalities10 q
  11. 11Graphing Systems of Inequalities10 q
  12. 12Unit Review: Systems of Equations10 q
Unit 8: Exponents and Scientific Notation 12 lessons
  1. 1Introduction to Exponents: Powers and Bases10 q
  2. 2Product of Powers and Power of a Power10 q
  3. 3Quotient of Powers and Power of a Quotient10 q
  4. 4Zero and Negative Exponents10 q
  5. 5Scientific Notation: Writing Very Large Numbers10 q
  6. 6Scientific Notation: Writing Very Small Numbers10 q
  7. 7Multiplying and Dividing in Scientific Notation10 q
  8. 8Applications of Scientific Notation in Science and Creation10 q
  9. 9Exponential Growth: Doubling Patterns10 q
  10. 10Exponential Decay: Half-Life Concepts10 q
  11. 11Comparing Exponential vs. Linear Growth10 q
  12. 12Unit Review: Exponents and Scientific Notation10 q
Unit 9: Polynomials 12 lessons
  1. 1Introduction to Polynomials: Terms, Degree, and Leading Coefficient10 q
  2. 2Adding Polynomials10 q
  3. 3Subtracting Polynomials10 q
  4. 4Multiplying Monomials10 q
  5. 5Multiplying a Polynomial by a Monomial10 q
  6. 6Multiplying Binomials: The FOIL Method10 q
  7. 7Multiplying Binomials: The Box (Area) Method10 q
  8. 8Special Products: (a+b)^2 and (a-b)^210 q
  9. 9Special Products: (a+b)(a-b) — Difference of Squares10 q
  10. 10Polynomial Long Multiplication (Higher Degree)10 q
  11. 11Real-World Applications of Polynomials (Area, Volume)10 q
  12. 12Unit Review: Polynomials10 q
Unit 10: Factoring Polynomials 12 lessons
  1. 1Greatest Common Factor (GCF) of Monomials10 q
  2. 2Factoring Out the GCF from a Polynomial10 q
  3. 3Factoring by Grouping10 q
  4. 4Factoring Trinomials: x^2 + bx + c (Leading Coefficient = 1)10 q
  5. 5Factoring Trinomials: ax^2 + bx + c (Leading Coefficient ≠ 1)10 q
  6. 6Factoring Perfect Square Trinomials10 q
  7. 7Factoring Difference of Two Squares10 q
  8. 8Factoring Sum and Difference of Cubes10 q
  9. 9Mixed Factoring Strategy: Choosing the Right Method10 q
  10. 10Solving Quadratic Equations by Factoring10 q
  11. 11Applications of Factoring (Area and Number Problems)10 q
  12. 12Unit Review: Factoring Polynomials10 q
Unit 11: Rational Expressions and Equations 12 lessons
  1. 1Introduction to Rational Expressions10 q
  2. 2Simplifying Rational Expressions: Canceling Common Factors10 q
  3. 3Multiplying Rational Expressions10 q
  4. 4Dividing Rational Expressions10 q
  5. 5Adding Rational Expressions with Like Denominators10 q
  6. 6Finding the Least Common Denominator (LCD)10 q
  7. 7Adding and Subtracting Rational Expressions with Unlike Denominators10 q
  8. 8Complex Fractions: Simplifying Nested Fractions10 q
  9. 9Solving Rational Equations10 q
  10. 10Extraneous Solutions in Rational Equations10 q
  11. 11Proportions and Cross-Multiplication Applications10 q
  12. 12Unit Review: Rational Expressions10 q
Unit 12: Radical Expressions and Equations 12 lessons
  1. 1Square Roots: Perfect Squares and Estimation10 q
  2. 2Simplifying Radical Expressions10 q
  3. 3Adding and Subtracting Radicals10 q
  4. 4Multiplying Radical Expressions10 q
  5. 5Dividing Radicals and Rationalizing the Denominator10 q
  6. 6The Pythagorean Theorem and Square Roots10 q
  7. 7The Distance Formula10 q
  8. 8The Midpoint Formula10 q
  9. 9Introduction to Cube Roots and Higher Roots10 q
  10. 10Solving Radical Equations (Part 1)10 q
  11. 11Solving Radical Equations (Part 2) — Extraneous Solutions10 q
  12. 12Unit Review: Radical Expressions10 q
Unit 13: Quadratic Functions 12 lessons
  1. 1Introduction to Quadratic Functions: y = ax^2 + bx + c10 q
  2. 2Graphing Quadratic Functions: Parabolas10 q
  3. 3The Vertex and Axis of Symmetry10 q
  4. 4Finding the Vertex Using the Formula x = -b/(2a)10 q
  5. 5Transformations of Quadratic Functions10 q
  6. 6Solving Quadratic Equations by Graphing10 q
  7. 7Solving Quadratic Equations by Square Roots10 q
  8. 8Completing the Square10 q
  9. 9The Quadratic Formula10 q
  10. 10The Discriminant: How Many Real Solutions?10 q
  11. 11Applications of Quadratic Functions (Projectile, Area)10 q
  12. 12Unit Review: Quadratic Functions10 q
Unit 14: Data, Statistics, and Probability 12 lessons
  1. 1Measures of Central Tendency: Mean, Median, Mode10 q
  2. 2Measures of Spread: Range and Interquartile Range10 q
  3. 3Box Plots and Five-Number Summaries10 q
  4. 4Histograms and Frequency Distributions10 q
  5. 5Scatter Plots and Correlation10 q
  6. 6Line of Best Fit and Predictions10 q
  7. 7Introduction to Probability: Sample Space and Events10 q
  8. 8Theoretical vs. Experimental Probability10 q
  9. 9Compound Probability: AND and OR Events10 q
  10. 10Permutations and Combinations10 q
  11. 11Statistical Reasoning and God's Order in Data10 q
  12. 12Unit Review: Data, Statistics, and Probability10 q
Unit 15: Comprehensive Review and Applications 12 lessons
  1. 1Cumulative Review: Equations and Inequalities10 q
  2. 2Cumulative Review: Linear Functions and Graphing10 q
  3. 3Cumulative Review: Systems of Equations10 q
  4. 4Cumulative Review: Exponents and Polynomials10 q
  5. 5Cumulative Review: Factoring10 q
  6. 6Cumulative Review: Rational and Radical Expressions10 q
  7. 7Cumulative Review: Quadratic Functions10 q
  8. 8Algebra in Science: Using Formulas in Creation Studies10 q
  9. 9Algebra in Finance: Stewardship and Math10 q
  10. 10Algebra in Geometry: Area, Perimeter, and Volume10 q
  11. 11Problem-Solving Strategies and Mathematical Thinking10 q
  12. 12Final Review: Algebra I Mastery Celebration10 q

One whole lesson, exactly as it comes

This is a real lesson taken from the middle of the course — the teaching text, the practice, the homework, and the first three quiz questions with their answers. It is not a marketing excerpt.

Unit 8: Exponents and Scientific Notation · Lesson 7

Multiplying and Dividing in Scientific Notation

55 minutesPencilGraph paperBible (KJV)Calculator (optional)

What this lesson is for

  • Understand and apply concepts from: Multiplying and Dividing in Scientific Notation
  • Complete the worked examples and practice problems
  • Connect lesson content with biblical worldview

Multiplying and Dividing in Scientific Notation

Multiply: multiply the a's, add the exponents. Divide: divide the a's, subtract exponents. Adjust to keep 1 <= |a| < 10.

Key Vocabulary

  • Multiply: a's multiply, exponents add
  • Divide: a's divide, exponents subtract

Worked Examples

Example 1: (210^3)(310^4) = 6 * 10^7.

Example 2: (410^5)(210^-2) = 8 * 10^3.

Example 3: (610^8)/(310^2) = 2 * 10^6.

Example 4: (510^4)(410^3) = 2010^7 = 210^8.

Real-World Application

Astronomers compute distances/times across the universe in scientific notation.

Christian Worldview Connection

Psalm 8:4 — what is man? In a universe of 10^80 atoms, God is mindful of us.

Study Tips

Math is best learned actively. Work each example yourself with pencil and paper before peeking at the solution. After completing the practice, redo any problems you missed without looking. Repetition cements the concept into memory.

Try teaching today's idea aloud to a parent or sibling. If you can explain it clearly, you understand it. If you stumble, that pinpoints what to review.

Common Mistakes to Avoid

Watch your signs carefully — a missed negative is the most common error in algebra. Always show your work in clear, ordered steps so you can find your own slips. When checking an answer, plug it back into the ORIGINAL equation, not into a step you derived along the way.

Looking Ahead

Today's skill will be used in tomorrow's lesson and throughout this entire unit. Algebra builds in chains: weakness in one link breaks the next. Master today's idea before moving on. With prayer, persistence, and practice you will succeed in honoring God with the mind He has given you.

Homework

Complete assigned practice problems. Show all work.

The first three of this lesson's 10 questions

(2*10^3)(3*10^2) = ?

  1. 6*10^5
  2. 5*10^5
  3. 6*10^6
  4. 6*10^1
Show the answer

Answer: 6*10^5

(4*10^5)(2*10^3) = ?

  1. 8*10^8
  2. 6*10^8
  3. 8*10^15
  4. 6*10^15
Show the answer

Answer: 8*10^8

(6*10^8)/(2*10^3) = ?

  1. 3*10^5
  2. 3*10^11
  3. 8*10^5
  4. 12*10^5
Show the answer

Answer: 3*10^5

Another 7 questions follow in the lesson itself, each one graded the moment it is answered.

What comes with the download

180 full lessons

Across 15 units, each with objectives, a teaching passage written to be read aloud, guided practice, and homework.

1,800 quiz questions

Graded the instant they are answered, each with the explanation of why that answer is right.

A gradebook that works

Every score kept, a running average maintained, and a breakdown unit by unit — all in the file itself, nothing sent anywhere.

Progress and attendance

Tick lessons off as they are finished, watch the completion bar fill, and mark days present, absent, or excused.

Report card and certificate

Both printable, with your student's name, the grades, and the dates already filled in.

Backup you control

Export every record to a file you keep, and read it back later. A lost browser cache cannot take the year with it.

An answer key

Hidden from the student by default, there for the parent marking the work.

Nothing that phones home

No ads, no affiliate links, no analytics, no fonts fetched from elsewhere. Unplug the network cable and every one of these files still works.

What you will need

Drawn from the materials named across all 180 lessons of this course. Most families already own most of it.

Download Algebra I — Grade 9

Free, and free of everything else. 17 files, 16.5 MB in total. No account, no email address, no payment. What you download carries no advertising, no affiliate links and no tracking of any kind.