Estimate Products micro-lesson

Chris Lindsey

Maths

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Learning time

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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.

Answer time

Kids earn more screen time by answering fun educational 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.

1) 270

2) 240

3) 27

4) 2700
What is the best estimate for 76 x 4?

1) 320

2) 280

3) 3200

4) 764
What is the best estimate for 12 x 37?

1) 400

2) 300

3) 500

4) 40
Estimate the product of 32 x 9 by rounding 32 to the nearest ten.

1) 270

2) 300

3) 290

4) 310
Estimate the product of 491 x 7 by rounding 491 to the nearest hundred.

1) 3500

2) 350

3) 2800

4) 280
Round your factors to find the best estimate for 28 x 17.

1) 600

2) 500

3) 700

4) 800
What is the best estimate for 92 x 6?

1) 540

2) 600

3) 450

4) 90
Use compatible numbers to estimate 38 x 17.

1) 800

2) 900

3) 700

4) 1000
What is the estimate for 19 x 48 if you round both factors to the nearest ten?

1) 1000

2) 950

3) 400

4) 900
Estimate the product of 657 x 2 by rounding 657 to the nearest hundred.

1) 1400

2) 1314

3) 1300

4) 1200
What is the best estimate for 28 x 82?

1) 2400

2) 1600

3) 24000

4) 160
What is the best estimate for 8,032 x 3?

1) 24000

2) 2400

3) 240

4) 32000
What is the best estimate for 46 x 97?

1) 5000

2) 4600

3) 6000

4) 4000
Round 7,928 to the nearest thousand, then multiply it by 8 to find the estimated product for 7,928 x 8.

1) 64000

2) 6400

3) 56000

4) 1600
What is the closest estimate for 71 x 92?

1) 6300

2) 7200

3) 5600

4) 7000
What is the best estimate for 57 x 38?

1) 2400

2) 24000

3) 240

4) 1500
Which fact can help you solve 20 x 20?

1) 2 x 2

2) 2 x 10

3) 4 x 4

4) 2 x 40
When you estimate 23 x 17, to what should you round each factor?

1) 23 to 20 and 17 to 20

2) 23 to 30 and 17 to 20

3) 23 to 20 and 17 to 10

4) 23 to 30 and 17 to 10
What are two closest compatible numbers for the factors 46 and 97?

1) 50 and 100

2) 40 and 100

3) 50 and 90

4) 40 and 90
What are compatible numbers?

1) Numbers close to your factors that you can easily multiply mentally.

2) All numbers that have a zero.

3) Numbers a little larger than your factors.

4) Numbers you have rounded down.
Connor says 420 is a good estimate for 7 x 63. Is he correct?

1) Yes

2) No
Amy multiplied 56 x 32 and got an answer of 17,920. Is this a reasonable answer?

1) No

2) Yes
Kara says 63,000 is a good estimate for 71 x 92. Is she correct?

1) No

2) Yes
One reason you might want to find an estimate instead of finding the exact answer is to see if your answer is reasonable.

1) TRUE

2) FALSE
The actual answer for 7 x 42 will be between 280 and 350.

1) TRUE

2) FALSE

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Chris Lindsey

Elementary Teacher in South Carolina, USA. I have been teaching 4th and 5th grades for the past 11 years. My passion is teaching Math, but my love is reading aloud to children.

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