Question

Estimate (11.49 - 5.15) by rounding before you add or subtract.

a) About 7
b) About 5
c) About 8
d) About 6

Answer 1

To estimate the difference of 11.49 and 5.15, round the numbers to the nearest whole numbers before subtracting. The result is approximately 6 after rounding 11.49 down to 11 and 5.15 down to 5.

Step-by-step explanation:

To estimate the result of subtracting 11.49 and 5.15, we can round these numbers before performing the operation. Rounding 11.49 to the nearest whole number gives us 11, and rounding 5.15 gives us 5. We then subtract the rounded numbers: 11 - 5 = 6. Therefore, the estimated result is about 6.

The subject matter is mathematics, specifically estimation and rounding in calculations. When rounding, if the number to be dropped is 5 or above, we round up; if it is less than 5, we round down. For example:

• 31.57 rounds up to 32
• 8.1649 rounds down to 8.16
• 0.051065 rounds down to 0.05106
• 0.90275 rounds up to 0.9028