Write a story problem for each of the following addition and subtraction problem types, using the problem 6 + 9 = 15: join result unknown, join change unknown, join start unknown, separate result unknown, part-part-whole—whole unknown, part-part-whole—part unknown, and one compare problem. Label each problem with its problem type and draw pictures to show how each problem could be modeled
with manipulative materials.
What will be an ideal response?
See Figure 7-2 in the textbook for sample problems and pictures.
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