# How to Calculate 1/3 Plus 3/7

Are you looking to work out and calculate how to add 1/3 plus 3/7? In this really simple guide, we'll teach you exactly what 1/3 + 3/7 is and walk you through the step-by-process of how to add two fractions together.

To start with, the number above the line in a fraction is called a numerator and the number below the line is called the denominator.

Why do you need to know this? Well, because the easiest way to add fractions together is to make sure both fractions have the same denominator.

Let's set up 1/3 and 3/7 side by side so they are easier to see:

Our denominators are 3 and 7. What we need to do is find the lowest common denominator of the two numbers, which is 21 in this case.

If we multiply the first denominator (3) by 7 we will get 21. If we we multiply the second denominator (7) by 3 we will also get 21. We also need to multiply the numerators above the line by the same amounts so that the fraction values are correct:

This is what 1/3 plus 3/7 looks like with the same denominator:

Now that these fractions have been converted to have the same denominator, we can add the result together to make one fraction:

You're done! You now know exactly how to calculate 1/3 + 3/7. Hopefully you understood the process and can use the same techniques to add other fractions together. The complete answer is below (simplified to the lowest form):

## Convert 1/3 plus 3/7 to Decimal

Here's a little bonus calculation for you to easily work out the decimal format of the fraction we calculated. All you need to do is divide the numerator by the denominator and you can convert any fraction to decimal:

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### Preset List of Fraction Addition Examples

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