Estimate multi digit products by rounding factors to a basic fact
10
Curipod generated lesson: "Estimate multi digit products by rounding factors to a basic fact". #1-4
michelle.briggs
Updated 2 months ago
1. Word cloud
120 seconds
What is the basic fact for 7 times 8?
2. Slide
60 seconds
Rounding to Estimate Multi-Digit Products
Round each factor to the nearest basic fact to estimate the product without having to calculate it. This can make it easier to quickly determine the approximate answer. For example, if the product of 12 and 34 is needed, round each factor to 10 and 30 to get an approximate answer of 300.
3. Slide
60 seconds
Did you know?
When estimating products of two-digit numbers, the product of the last digits is always a multiple of 10. The first digit of the product is always equal to the sum of the first digits of the two factors. Estimation can help you calculate the approximate answers to math problems faster than using a calculator.
4. Open question
180 seconds
Work together in pairs: What is the product when you round 478 x 6 to the nearest 10?
5. Personalised Feedback
360 seconds
If you were estimating the product of 48 and 9 by rounding each factor to the nearest ten, what would your estimation be?
6. Open question
180 seconds
Work together in pairs: What is the product if you round 478 x 23 to a basic fact?
7. Drawings
450 seconds
Brain break: Draw a banana superhero flying through the sky, cape and all
8. Poll
60 seconds
What is the estimated product of 23 x 6 if you round 23 to the nearest ten and 6 to the nearest whole number?
- 120
- 100
- 140
- 150
9. Poll
60 seconds
Estimate the product of 35 x 9 by rounding both numbers to the nearest ten.
- 300
- 200
- 500
- 400
10. Poll
60 seconds
If you round 47 to the nearest ten and round 3 to the nearest whole number, what is an estimate for their product?
- 50
- 150
- 100
- 200
11. Poll
60 seconds
Rounding factors in multiplication estimation helps us get a ______ answer.
- Quick
- Confusing
- Long
- Exact
12. Poll
60 seconds
What is an estimate for the product of 68 x 7 if we round both numbers to the nearest ten?
- 700
- 500
- 400
- 600
13. Poll
60 seconds
Round the factors to estimate a product: 597 x 52
- 500 x 50
- 600 x 60
- 600 x 50
- 590 x 60
14. Poll
60 seconds
Round the factors to estimate the product: 1,103 x 59
- 2,000 x 50
- 1,000 x 60
- 1,500 x 60
- 1,000 x 50
15. Drawings
450 seconds
Draw a giraffe wearing a tutu, holding a balloon with a surprised expression on its face!
16. Poll
60 seconds
Round and estimate the product of 89 ten x 63 tens
- 450
- 4500
- 5400
- 540000
17. Poll
60 seconds
Round the factors to estimate the product: 5,840 x 25
- 5,500 x 20
- 5,000 x 30
- 6,000 x 3
- 6,000 x 30
18. Poll
60 seconds
For which of the following would 200,000 be a good estimate
- 2,146 X 12
- 21,467 X 121
- 2,146 X 121
- 21,477 X 1,217
19. Drawings
450 seconds
Max saves $423 a month for college. About how much money did he save in 4 years? *ESTIMATE
20. Poll
60 seconds
Will the estimate that you made of college tuition be more or less than the actual amount?
- Lower
- Lower
- Higher
- Higher
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