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# 3.17: Decimal Addition

Difficulty Level: At Grade Created by: CK-12
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### Vocabulary

Here are the vocabulary words found in this Concept.

Sum
Vertically
up and down

### Guided Practice

Here is one for you to try on your own. Be sure to line up the digits vertically before adding.

4.56+.98+1.024\begin{align*}4.56 + .98 + 1.024\end{align*} = _____

Our answer is 6.564.

### Video Review

Here is a video for review.

### Practice

Directions: Add the following decimals.

1. 4.5 + 6.7 = _____

2. 3.45 + 2.1 = _____

3. 6.78 + 2.11 = _____

4. 5.56 + 3.02 = _____

5. 7.08 + 11.9 = _____

6. 1.24 + 6.5 = _____

7. 3.45 + .56 = _____

8. 87.6 + 98.76 = _____

9. 76.43 + 12.34 = _____

10. 5 + 17.21 = _____

11. 78 + 13.456 = _____

12. .456 + .23 + .97 = _____

13. 1.234 + 4.5 + 6.007 = _____

14. 3.045 + 3.3 + 9 = _____

15. 23 + 4.56 + .0091 = _____

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### Vocabulary Language: English

TermDefinition
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).
Rounding Rounding is reducing the number of non-zero digits in a number while keeping the overall value of the number similar.
Sum The sum is the result after two or more amounts have been added together.
Vertically Vertically means written up and down in columns.

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