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Answer to Problem 20: $135 for each monthly payment Strategies may vary. Example:

You could write a number sentence. Since the amount is divided into 24 equal payments, you would divide the total cost of the piano by 24. $3,240 ÷ 24 = 135.

TEACHER NOTES:

Having students discuss their solution strategies helps them solidify their understanding and see likenesses and differences between their own strategies and their classmates’. Having students verbalize or write about their thinking gives the teacher a wealth of information regarding a student’s understanding about the concept and about number in general.