How to Add Numbers with Decimals

Now that we have finished learning fractions, we proceed to the learning about decimals. A decimal is another representation of numbers. For instance, the fraction \frac{1}{2} can be represented with 0.5 and the decimal 3 \frac{1}{5} can be represented with 3.2.

In this post, we are going to learn about addition of decimals. In learning decimals, there is just one simple rules: write the numbers, one under the other such that the decimal points are aligned.

Example 1: 3.02 + 80.401

In adding 3.02 and 80.401, the decimal part of the 80.401 has more digits that that of 3.02. But there is no number to the right of 2, so we can just put 0.

adding numbers with decimals

Remember that adding 0 to the right hand size of the last number in the decimal does not change its value. That is, 0.02, 0.020, 0.0200, 0.02000 are just the same, so we did not change its value.

Example 2: 1.95 + 180.2 + 20.003

adding decimals2


Example 3: 5.5 + 2.21 + 3.891

Well, I think you can do this on your own. The answer is 11.601.

Of course, in the actual Civil Service Exam where time is essential, you do not really to put all the 0’s as I have done above. You can just align the decimal points and add the corresponding columns. In case there is just one number in one column, just copy the number on the sum.

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4 Responses

  1. February 11, 2014

    […] rule in subtraction of decimals is the same with addition of decimals. First, position the numbers such that the decimal points are aligned. Then, add zeros to make the […]

  2. February 17, 2014

    […] week, I discussed how to add numbers with decimals and I have created a supplementary video about the post. As I have discussed, in adding decimals, […]

  3. March 21, 2014

    […] created an Adding Decimals Video Tutorials which will be a supplement on How to Add Decimals. I think the examples here can be a supplement to the post I made earlier. The videos are both in […]

  4. April 23, 2014

    […] you are not familiar with the steps in adding decimals, please read How to Add Decimals. In the quiz below, you will know if your answer is correct after each […]

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