Adding Decimals


Eoin earned €8.85 mowing lawns and Sara earned €7.10 delivering leaflets. How much money do they have between them? Estimate to the nearest euro.


€8.85 to the nearest euro = €9 €7.10 to the nearest euro = €7 Therefore, €9 + €7 = €16


Now let’s see if this was a good estimate by adding the 2 amounts of money that Eoin and Sara earned.


_______ €15.95


€ 8.85 € 7.10


The golden rule when adding or subtracting decimals is to make sure that the decimal points are always directly underneath each other. That way, the tens are always under the tens, the units are under the units, the tenths are under the tenths and so on.


Kevin bought some groceries weighing 4.637kg, 21.4kg and 6.82kg and is about to cycle home on his bicycle. He has to put them in the basket on the bicycle and wants to know how heavy they are altogether. Can you help him?


Try this one: 4.637 + 21.4 + 6.82 =


4.637 21.4


+ 6.82 kg ______ We can put in 0 as placeholders after the number, so our sum now looks like this:


4.637 21.400


+ 6.820 kg ______ Have a go! 21.4kg 4.637kg 6.82kg


126 Decimals


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