Reteach and Skills Practice Workbook

15–5
Name
Reteach
(continued)
Problem-Solving Investigation
Date
4MR1.1, 4SDAP1.1
Use any strategy shown below to solve.
Tell what strategy you used.
• Solve a simpler problem
• Use logical reasoning
• Draw a picture
• Make a model
• Work backward
1. The R train comes every 42 minutes. The next time the R train will
arrive is 10:23 A.M. What time did the R train last come?
Strategy:
2. The number of acorns on the sidewalk doubles every 6 hours.
After 1 day, there are 96 acorns. How many were there at the
beginning of the day?
Strategy:
3. Tim bought 4 books for $16. If each book costs the same amount,
how much would 15 books cost?
Strategy:
4. Two numbers have a product of 48 and a difference of 8.
What are these two numbers?
Strategy:
5. Ashley takes care of her neighbor’s pets for $3.50 a day. How
Copyright © Macmillan/McGraw-Hill, a division of The McGraw-Hill Companies, Inc.
many days would she need to work to earn $31.50?
Strategy:
Grade 4 282 Chapter 15