Problem: Mrs. Smith bought 67 packs of pencils, each containing 10 pencils. How many pencils did she buy in total?
Solution:
To solve this problem, we need to multiply the number of packs by the number of pencils in each pack. However, since we are dealing with a number greater than 10, we need to regroup to make a ten.
67 packs x 10 pencils = 670 pencils
Therefore, Mrs. Smith bought a total of 670 pencils. We had to regroup to make a ten because multiplying 67 by 10 directly would have resulted in an incorrect answer. By regrouping, we were able to correctly calculate the total number of pencils she bought.
Write and solve a problem where you need to regroup to make a ten or a hundred. Explain why you needed to regroup.
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