Adding & Subtracting Decimals

Adding and subtracting decimals is the same as adding and subtracting whole numbers, except that you need to make sure all numbers have the same number of digits before starting and that you don’t move the decimal point.

For example if you were asked

7.4 + 9 + 3.768 = ?

It will be easiest to add zeros so that all numbers have the same number of digits as the number with the most digits, in this case 3.768 has 4 digits.

You should set it up the same way for subtraction since it will make borrowing easier to visualize.

7 – 5.05 = ?

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9 comments

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  5. Anonymous says:

    I’ve been studying for the MATH part of the GED test for 21 months, failed it twice, now i’ve been brushing up on my math skills for about 2 months to over prepare myself. I came across this site AND let me just say THANK YOU! all i needed was a little explanation and break down the problem to better understand it. This has helped me enough to feel confident to pass it this time. I take my Math test for the GED nest week 🙂

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  8. Bethany says:

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