Question

what is the best estimate for the product of 289 and 7

Answer 1

289 is approximately 300
7 is approximately 10

300 x 10 = 3,000

Answer 2

$289 \approx 300\\7 \approx 10\\\\289 \times 7 \approx 300\times 10 \approx3,000$

So 3,000 is your answer