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Year 7 Interactive Maths - Second Edition


Addition of Decimals

To add decimal numbers, write them with decimal points below one another.

E.g.  To add 6.7 + 3.9 + 4.6 write the decimal numbers with decimal points beneath one another as follows:

Note that the decimal points lie beneath one another.


Note:

The decimal point in the answer is lined up with the decimal points in the numbers being added.


Zeros at the End of a Decimal

The value of a decimal number is not altered when zeros are placed at the end of a number.

For example, the number 8 can be written as 8.0, 8.00, 8.000, … and so on.
The number 12.7 can be written as 12.70, 12.700, 12.7000, … and so on.

We use this fact to add decimals, as illustrated in the following example.


Example 7

Calculate 5.84 + 8 + 12.79.

Solution:

To add the given decimal numbers, insert zeros so that all of the numbers have the same number of decimal places and write the numbers with decimal points below one another.

Note that the decimal points lie beneath one another.


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