Concept explainers
a. Write a multiplicative comparison problem for
b. Draw a strip diagram to accompany your problem in part (a).
c. Discuss why a student might mistakenly attempt to solve your problem in part (a) by multiplying 21 by 3 instead of by dividing 21 by 3. Explain how drawing a strip diagram might be helpful.
d. Reformulate your problem in part (a), but this time use the fraction
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