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## Add and subtract decimals by lining up the decimal points.

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Find each sum.

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Round to the nearest tenth, then find the sum.

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Round to the nearest hundredth, then find the sum.

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### Vocabulary Language: English

Decimal

Decimal

In common use, a decimal refers to part of a whole number. The numbers to the left of a decimal point represent whole numbers, and each number to the right of a decimal point represents a fractional part of a power of one-tenth. For instance: The decimal value 1.24 indicates 1 whole unit, 2 tenths, and 4 hundredths (commonly described as 24 hundredths).
Estimate

Estimate

To estimate is to find an approximate answer that is reasonable or makes sense given the problem.
Rounding

Rounding

Rounding is reducing the number of non-zero digits in a number while keeping the overall value of the number similar.