Video: Understanding Place Value When Multiplying and Rounding

Which of the following is closest to 11 × 21? [A] 20 [B] 2000 [C] 20000 [D] 200.

01:10

Video Transcript

Which of the following is closest to 11 times 21? a) 20, b) 2000, c) 20000, d) 200.

To solve this problem, why don’t we round 11 times 21? 11 is close to 10. So we could find 10 times 21. 10 times 21 is 210.

Let’s look and see which one of our answer choices is closest to that amount. It won’t be 20000. And it won’t be 2000. Is 210 closer to 200 or to 20? 11 times 21 is closest to 200.

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