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Using Rectangles
Each container of fish eggs had 24 ounces of water to cover the eggs. How much water was in the 13 containers altogether?
“This multiplying is getting harder and harder,” said Nicholas. “Sometimes it's not so easy to multiply in our heads.”
“I agree, Nicholas,” said Mrs. Dewey. “One way to solve multiplication problems is to break them into smaller problems that are easier to solve. Grace, how would you break this problem into smaller problems?”
“Sometimes I draw a rectangle,” said Grace. “I use grid paper if I have it, but when I don't, I just draw rectangles on regular paper. Here's how I do it.”
Grace drew two rectangles to show how she breaks the numbers in a multiplication problem into tens and ones.
- Explain why there are four parts to Grace's rectangles. What does the area of each part represent?