Estimate the following difference by rounding.
A) about 23,000,000
B) about 31,000,000
C) about 21,000,000
D) about 16,000,000
E) about 19,000,000

Question

Estimate the following difference by rounding. ​  ​
A) about 23,000,000 
B) about 31,000,000 
C) about 21,000,000 
D) about 16,000,000 
E) about 19,000,000

Quizplus · Accepted Answer

Rounding the digits in the given numbers to the nearest million, we get:
11ec1c4b ≈ 12,000,000
855500e7109a ≈ 34,000,000
Subtracting these rounded numbers, we get:
34,000,000 - 12,000,000 = 22,000,000
Rounding this answer to the nearest million gives us the closest choice, which is C) about 21,000,000.

Estimate the Following Difference by Rounding