Estimate products – multiply by 1-digit numbers
Learn with an example
🔥Estimate the product. Round the first factor to the nearest ten, and then multiply.
83 × 8
The product is approximately _________.
Round the first factor to the nearest ten.
| 83 | × | 8 | = ? |
| 80 | × | 8 | = ? |
Now multiply:
80 × 8 = 640
The product is approximately 640.
Compare your estimate to the exact answer:
83 × 8 = 664
🔥Estimate the product. Round the second factor to the nearest ten, and then multiply.
8 × 66
The product is approximately _________.
Round the second factor to the nearest ten.
| 8 | × | 66 | = ? |
| 8 | × | 70 | = ? |
Now multiply:
8 × 70 = 560
The product is approximately 560.
Compare your estimate to the exact answer:
8 × 66 = 528
🔥Estimate the product. Round the first factor to the nearest ten, and then multiply.
47 × 8
The product is approximately _________.
Round the first factor to the nearest ten.
| 47 | × | 8 | = ? |
| 50 | × | 8 | = ? |
Now multiply:
50 × 8 = 400
The product is approximately 400.
Compare your estimate to the exact answer:
47 × 8 = 376
Let’s practice!🖊️
