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Estimate products

Estimate the product 73 × 24. Round each factor to the nearest ten, then multiply.

Round the first factor to the nearest ten.

 73 × 24 = ? 70 × 24 = ?

Round the second factor to the nearest ten.

 70 × 24 = ? 70 × 20 = ?

Now multiply:

70 × 20 = 1,400

The product is approximately 1,400.

Compare your estimate to the exact answer:

73 × 24 = 1,752

Estimate the product 17 x 10. Round each factor to the nearest ten, then multiply.
Solution: