What is the basic fact for 7 times 8?
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.
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.
Work together in pairs: What is the product when you round 478 x 6 to the nearest 10?
If you were estimating the product of 48 and 9 by rounding each factor to the nearest ten, what would your estimation be?
Work together in pairs: What is the product if you round 478 x 23 to a basic fact?
Brain break: Draw a banana superhero flying through the sky, cape and all
What is the estimated product of 23 x 6 if you round 23 to the nearest ten and 6 to the nearest whole number?
Estimate the product of 35 x 9 by rounding both numbers to the nearest ten.
If you round 47 to the nearest ten and round 3 to the nearest whole number, what is an estimate for their product?
Rounding factors in multiplication estimation helps us get a ______ answer.
What is an estimate for the product of 68 x 7 if we round both numbers to the nearest ten?
Round the factors to estimate a product: 597 x 52
- 500 x 50
- 600 x 60
- 600 x 50
- 590 x 60
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
Draw a giraffe wearing a tutu, holding a balloon with a surprised expression on its face!
Round and estimate the product of 89 ten x 63 tens
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
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
Max saves $423 a month for college. About how much money did he save in 4 years? *ESTIMATE
Will the estimate that you made of college tuition be more or less than the actual amount?