Look at problem A. What number sentence will help you to solve the problem?
What is the missing number?
The missing number is 42.
What manipulatives can you use to solve
Base-ten blocks, a number line, and a hundreds chart.
How could you use base-ten blocks to solve
Possible response: Show 6 tens and 4 ones, take away 2 tens and 2 ones, and see what is left.
How could you use an open
number line to solve
Possible response: Start at 64 and hop back by 10s two
times. Hop back 2 more.
How could you use a hundreds chart to solve
Possible response: Start at 64 and skip count back by 10 two times. Move 2 spaces to the left.
Look at problem B. What number sentence will help you to solve the problem?
__ + 9 + 5 = 24
What is the number that completes this number sentence: __ + 9 + 5 = 24?
What strategy did you use to find the missing number?
Possible responses: I counted back 14 times from 24; I started at 14 and counted up until I got to 24.
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