Reteach and Skills Practice Workbook

8–6
Name
Reteach
Problem-Solving Investigation
Date
Mandy went shopping. Her mother gave her a bank card to use and
told her that she could not spend more than $200. Mandy spent $56
in the first store, $87 in the next, then $95, and finally $103. When she
got home, Mandy told her mother that she wasn’t sure but thought
she stayed under $200. Does this make mathematical sense?
4MR1.0, 4NS3.0
Chapter Resources
Understand
Be sure you understand the problem.
What do you know?
• Mandy has a limit of $200.
• She spent $56, $87, $95, and $103.
What do you need to find?
Plan
• You need to find if Mandy stayed within her limit.
Make a plan.
Copyright © Macmillan/McGraw-Hill, a division of The McGraw-Hill Companies, Inc.
You can use the make a table strategy to find how
much Mandy spent. You can estimate the amount
Mandy spent at each store and place the amounts in
the table.
Store #1 Store #2 Store #3 Store #4
$56 $87 $95 $103
Solve $56 + $87 + $95 + $103 = $341
Check
$341 - $200 = $141
So, Mandy spent $141 over her $200 limit.
Is the solution reasonable?
Reread the problem.
Check your answer.
Solve and tell what strategies you used.
1. Sandy spent $459 on gifts. She spent about $50 on each person.
How many people did she buy gifts for?
Grade 4 145 Chapter 8