Video: Estimation of Addition Expressions

Choose the number that is closest to 53 + 83. [A] 200 [B] 300 [C] 100.

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Video Transcript

Choose the number that is closest to 53 plus 83: 200, 300, or 100.

Before we can choose the number that’s closest to 53 plus 83, let’s estimate 53 plus 83. We can round 53 down to 50 and we can round 83 to 80. Now we’re asking, what is 50 plus 80? Five plus eight equals 13; then we bring over our zero. 50 plus 80 equals 130, and 130 is closest to 200, 300, or 100. 100, 130 is closest to 100.

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