Math topics

Decimals practice

Decimal place values sit to the right of the ones place: tenths, hundredths, and so on. When you add or subtract, line up the decimal points so each place matches, then compute as with whole numbers and bring the point straight down.

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Worked example

Problem. What is 10.5 + 15.5?

1. Line up the decimal points: 10.5 over 15.5.
2. Add tenths: 5 + 5 = 10 tenths → write 0, carry 1.
3. Add ones with the carry: 0 + 5 + 1 = 6, then tens: 1 + 1 = 2 → 26.0.

Answer. 26

Practice set

1. Practice 1. What is 3.2 + 1.4?

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   4.6

2. Practice 2. What is 5.0 − 2.3?

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   2.7

3. Practice 3. What is 0.25 + 0.75?

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   1

Related pages

• Percentages
• Fractions practice with hints
• Math for grades 3–5

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