Question

How is estimation helpful when adding and subtracting decimals

Answer 1

It makes equations easy so solve by mentally adding and subtracting numbers.

Step-by-step explanation

Estimation means getting something close to the answer. Estimating can also be called approximating.

For example 3.4 can be estimated to 3 in whole number.

When adding and subtracting decimals, estimation makes it easier. Operations can be done offhead without counting or using objects. Estimation is very helpful especially with middle school students who are actively doing addition and subtraction questions.

An equation can be solve mentally when allowed to estimate. For example,

1) 9.7 - 3.8 = 10 - 4

= 6.

2) 39.93 + 60.09 = 40 + 60

= 100.

Answer 2

Estimation is helpful because adding and subtracting decimals in your head can be hard. Estimating the answer with integers or whole numbers lets you know if your answer is roughly correct.