Question

estimate 8358 × 82 by first rounding each number so that it has only 1 nonzero digit.

Explanation:

Step1: Round 8358 to 1 non-zero digit

$8358 \approx 8000$

Step2: Round 82 to 1 non-zero digit

$82 \approx 80$

Step3: Multiply the rounded values

$8000 \times 80 = 640000$

Answer:

640000