Question

Which does NOT show a reasonable estimate of 360 * 439?

Answer 1

Answer:

A. 100,000

Step-by-step explanation:

Given expression,

$360\times 439$

Since, when we round only 439,

∵ 439 ≈ 400 ( nearest hundred )

$360\times 439\approx 360\times 400 = 144000\approx 140,000$

Hence, option 'B' shows a reasonable estimation,

When we round both 439 and 360 to nearest hundred,

That is, 439 ≈ 400, 360 ≈ 400

$360\times 439\approx 400\times 400 = 160,000$

Hence, option 'C' shows a reasonable estimation,

When we round 360 to nearest hundred and 440 to nearest ten,

That is, 360 ≈ 400, 439 ≈ 440

$360\times 439\approx 400\times 440= 175600\approx 180,000$

Hence, option 'D' shows a reasonable estimation.

Answer 2

A. 100000 is your answer