Unit 8: Problem Solving · Lesson 7
Problem Solving - Lesson 7
What this lesson is for
- The student will understand and practice Problem Solving - Lesson 7
- The student will solve problems related to this topic
Train up a child in the way he should go: and when he is old, he will not depart from it.
Proverbs 22:6
Sometimes a problem asks us to find ALL possible combinations or choices. If we just guess randomly, we will likely miss some and cannot be sure we have found everything. The MAKE A LIST strategy gives us a systematic method so every possibility is found and none is counted twice.
Here is the MAKE A LIST strategy: Step 1 — Identify the two (or more) things you are combining. Step 2 — Hold the first item from Group 1 CONSTANT and list all its pairings with Group 2. Step 3 — Move to the next item in Group 1 and repeat. Step 4 — Count the total items in the list — that is your answer.
Example: "You can choose a red or blue shirt, and green or brown pants. List all outfits." Hold "red shirt": Red + Green; Red + Brown. Now "blue shirt": Blue + Green; Blue + Brown. Total: 4 outfits. Organized listing found all 4!
Why does organization matter? If we guessed randomly — Red+Green, Blue+Brown, Red+Brown — we might stop at 3 and miss Blue+Green. The list catches every combination.
The ant of Proverbs 6:6-8 is praised for her wisdom and diligence — she does not forget a single grain. Making a complete, organized list is the same spirit: missing nothing, wasting nothing.
Activity: Make an organized list for each: 1) You can choose chocolate or vanilla ice cream AND a cone or a cup. How many combos? 2) You have 3 toys (ball, doll, car) and must choose 1. How many choices? List them. 3) You can draw a triangle, square, or circle, colored red, blue, or yellow. List all colored-shape combos — there should be exactly 9. Check your list carefully before counting!
Guided practice
Solve step by step: Ryan has 6 toy cars. He gets 5 more. How many cars now?
Show the steps and the answer
1. Read and underline: 6 and 5. 2. Circle question: How many cars? 3. Write: 6 + 5 = 11. 4. Answer: 11 cars.
Answer: 11
Solve: A tree had 12 apples. 4 fell off. How many apples on the tree?
Show the steps and the answer
1. Numbers: 12 and 4. 2. Question: How many on tree? 3. Fell off = subtract. 4. 12 - 4 = 8.
Answer: 8
Solve step by step: Lily has 8 pencils. Maya has 7 pencils. How many pencils together?
Show the steps and the answer
1. Read: Lily 8, Maya 7. 2. Question: together? 3. Combine (add): 8 + 7 = 15.
Answer: 15
Homework
Complete the practice page. Count objects around your house.
Note for the parent
This lesson on Problem Solving - Lesson 7 should take about 35 minutes. Stay nearby to help with reading and questions. Praise effort and progress.
The first three of this lesson's 10 questions
The MAKE A LIST strategy helps when you need to find ALL possible combinations. Why not just guess randomly?
Show the answer
Answer: Guessing misses combinations and might count the same one twice
You have a red shirt and a blue shirt, and black pants and white pants. How many shirt-pants combinations can you make?
Show the answer
Answer: 4
You have 3 types of fruit (apple, banana, orange) and 2 types of drink (milk, juice). How many possible snack combinations (1 fruit + 1 drink)?
Show the answer
Answer: 6
Another 7 questions follow in the lesson itself, each one graded the moment it is answered.