Look at problem A. What number sentence will help you to solve the problem?
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 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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