Subtraction of Decimals

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Year 7 Interactive Maths - Second Edition

Subtraction of Decimals

To subtract a small decimal number from a larger decimal number, write them down with the larger one on top and the decimal points underneath one another. Then calculate the subtraction as you would for whole numbers and line up the decimal point in the answer.

Example 8

Rewrite 3.67 – 1.83 in columns; and then calculate.

Solution:

Decomposition method or equals addition method

Example 9

Rewrite 83.47 – 57.684 in columns; and then calculate.

Solution:

Decomposition method or equals addition method

Note:

To add (or subtract) decimals, always fill empty place values with zeros so that all of the numbers have the same number of decimal places.

Example 10

Rewrite 24 – 8.327 in columns; and then calculate.

Solution:

Decomposition method or equals addition method

Note:

24 = 24.000

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