Reteach and Skills Practice Workbook

9–6
Name
Reteach
Problem-Solving Investigation
Choose the best strategy.
Using each of the SIX PROBLEM-SOLVING STRATEGIES:
• Use a four-step plan
• Work backward
• Make a table
• Look for a pattern
• Guess and check
• Act it out
Date
1. A four-step plan - The four steps are understand, plan, solve,
and check.
4MR1.0, 4NS3.0
Chapter Resources
If you are given several facts, list what you already know and what you
need to find out. To find this out, think about what you have to do
mathematically.
Practice
Jill wants to buy jeans that cost $50, a shirt that costs $20, and a belt
that costs $10. She has $100. Does she have enough money?
2. Work backward
Copyright © Macmillan/McGraw-Hill, a division of The McGraw-Hill Companies, Inc.
If you are given facts about the present and asked for information
about the past, you need to work backward. Again, you’ll have to think
about what you have to do mathematically.
Practice
Jill bought the jeans for $40 and a shirt on sale for $5. She has $55
left. How much money did she start with?
3. Make a table
If you are given a list of things and there are different numbers for
each thing, make a chart. Use the categories that you are given to
make the rows and columns on your chart.
Think about what you have to do mathematically to the numbers in
the chart.
Practice
Jill bought jeans for $40 and a belt for $5. Carol bought jeans for $10
and 3 belts for $5 each. Who spent more money?
Grade 4 163 Chapter 9