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Decimals & Place Value

JHS

Number

Concept

Add, subtract and round decimal numbers to a given place.

Walkthrough

Add 3.45 + 2.3.

  1. 1.To add decimals, line up the decimal points so that place values align.
  2. 2.Rewrite 2.3 as 2.30 so both numbers have two decimal places: 3.45 + 2.30.
  3. 3.Add the hundredths column: 5 + 0 = 5.
  4. 4.Add the tenths column: 4 + 3 = 7, and add the units: 3 + 2 = 5.
  5. 5.The sum is 5.75.

Answer

5.75

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