Estimate 27.34 + 12.95.

Estimate 27.34 + 12.95.

• A. 39.29
• B. 41.00
• C. 40.29
• D. 40.00

Answer: (D)

When estimating a sum, round each addend to a nearby easy number and then add the rounded values. For 27.34 and 12.95, you can round to whole numbers: 27 and 13, which gives 40. Alternatively, round to tens: 30 and 10, which also gives 40. So the reasonable estimate is 40.00. The exact sum is 40.29, but since this asks for an estimate, 40.00 is the best choice because it reflects the rounded totals.

When estimating a sum, round each addend to a nearby easy number and then add the rounded values. For 27.34 and 12.95, you can round to whole numbers: 27 and 13, which gives 40. Alternatively, round to tens: 30 and 10, which also gives 40. So the reasonable estimate is 40.00.

The exact sum is 40.29, but since this asks for an estimate, 40.00 is the best choice because it reflects the rounded totals.