Add and subtract decimals

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Learn it Line up the decimal points, fill empty places with zeros, then add or subtract as with whole numbers. Keep the decimal point in the same place.

Example: $5.4 - 2.75$

Write 5.4 as 5.40 so the places line up.
$5.40 - 2.75$: hundredths 0 − 5 needs regrouping → 10 − 5 = 5.
Tenths: 3 − 7 needs regrouping → 13 − 7 = 6. Ones: 4 − 2 = 2.
Answer: 2.65.

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