Estimate the product by rounding to the nearest 10 345×21

Answer 1

To estimate the product of 345 and 21 by rounding to the nearest ten:

1. Round 345 to the nearest ten:
   345 rounds to 350.

2. Round 21 to the nearest ten:
   21 rounds to 20.

Now, multiply the rounded numbers:
350 × 20 = 7000.

Thus, the estimated product of 345 × 21 is approximately 7000.