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Curipod generated lesson: "Estimate multi digit products by rounding factors to a basic fact". #1-4

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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