Problem set #4.
Solve in at least two ways.
30 – 12 = ___
20 + ___ = 45
40 + 21 = ___
I wrote these problems without a story context to find out if children could connect numbers and context. It seemed from previous sessions with the children that they understood operations. Because they have been using a lot of strategies based on ones but not tens (for example, using tally marks), I used multiples of ten in these problems. Before the children started working on these problems, I made sure each child had 70 unifix cubes in groups of ten in front of him or her (we’ve been working on keeping them in tens).
Posted in Case Study: Four Second Graders, Problems, Uncategorized | Comments (0)
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