Multiply with Confidence: The Power of Estimation in Multiplication

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Transcript
When you multiply 2 numbers, sometimes you don't want an exact answer. You want an estimate. Let's say we have 92 marbles in each jar, and we have 6 jars, and we want to know approximately how many marbles we have altogether. So, we can round 92 to 90, 9 x 6 which is 54 and tack on our zero. So, our estimate is 540 marbles. Using an area model to multiply 92 x 6, we came out to 552 which is very close to our estimate of 540. So that's a reasonable answer. Let's try estimating 23 x 17. We can round 23 to 20 and 17 also to 20. Use your facts, 2 x 2 which is 4 and tack on two zeros. Multiply 23 x 17 and we come out with 391 which is very close to our estimate of 400. We've used compatible numbers; those are numbers easily multiplied in your head. Use compatible numbers when you want to estimate your products.

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Sample Questions
Here are some example of questions about this video that kids may be asked in the 1Question app to earn screen time:

Estimate the product 3 x 89.
270
240
27
2,700

What is the best estimate for 76 x 4?
320
280
3,200
764

What is the best estimate for 12 x 37?
400
300
500
40

Estimate the product of 32 x 9 by rounding 32 to the nearest ten.
270
300
290
310
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