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- Solve these problems using Frank's strategy. Look for ways to group and order the numbers to make an easy mental math problem.
- 6 2 3 =
- 4 4 5 =
- 7 5 2 =
- 3 3 2 5 =
- 6 4 5 =
- 4 3 5 =
- 3 10 6 =
- 4 10 2 =
- 3 10 7 =
- 7 3 10 =
- 8 1 40 =
- 4 30 2 =
- Choose two problems from Questions 5A–L. Show your solution strategies.
Use the Multiplying by Multiples of 10 pages in the Student Activity Book to look for patterns when multiplying by ten.
Exponents
Mrs. Dewey asked, “If you started with two apples in your basket on Monday, and then you doubled the number of apples you had each day, how many apples would you have on Wednesday?”
John said, “On Monday you would have 2 apples. Then on Tuesday you would double it, so you would have 4 apples. Then on Wednesday you would double again, so you would have 8 apples.”
Mrs. Dewey asked, “Can you write a number sentence to show how you got that answer?”
John wrote: 2 2 2 = (2 2) 2 = 4 2 = 8 apples
“Good,” said Mrs. Dewey. “And can anyone write this number sentence a shorter way?”
“I can,” said Jessie.
Jessie wrote: 23 = 8 apples