Question

n expression to the best estimate of the product.
508 × 19
13 × 102
52 × 97
answer bank
10,000
5,000
1,000

Explanation:

Step1: Round factors for 508×19

$508 \approx 500$, $19 \approx 20$; $\quad 500 \times 20 = 10,000$

Step2: Round factors for 13×102

$13 \approx 10$, $102 \approx 100$; $\quad 10 \times 100 = 1,000$

Step3: Round factors for 52×97

$52 \approx 50$, $97 \approx 100$; $\quad 50 \times 100 = 5,000$

Answer:

$508 \times 19
ightarrow 10,000$
$13 \times 102
ightarrow 1,000$
$52 \times 97
ightarrow 5,000$