Question

Estimate the difference of the decimals below by rounding to the nearest whole number.

38.751−4.149

A. 34
B. 35
C. 39
D. 42

Answer 1

To estimate the difference of decimals, round each decimal to the nearest whole number, then subtract the rounded numbers. Examples include 56.0 + 3.44 estimated as 59 and 45.99 - 32.8 estimated as 13.

Step-by-step explanation:

To estimate the difference of the decimals below by rounding to the nearest whole number, follow these steps:

1. Round each decimal to the nearest whole number.
2. Subtract the rounded numbers.

Here are the examples:

1. 56.0 + 3.44 = 56 + 3 = 59 (rounding 3.44 to 3)
2. 0.00665 + 1.004 = 0 + 1 = 1 (rounding 0.00665 to 0)
3. 45.99 - 32.8 = 46 - 33 = 13 (rounding 45.99 to 46 and 32.8 to 33)
4. 59.35 g + 35.5 g + 23.85 g = 59.4 g + 35.5 g + 23.9 g = 118.8 g (round each to the tenths place and sum)
5. When subtracting whole numbers like 78,500 m - 362 m, round to the last significant digit to the left of the decimal point: 78,100 m.
6. The number of significant figures in 0.0009 is 1, in 15,450.0 is 7, in 6x10³ is 1, in 87.990 is 5, and in 30.42 is 4.