Adding and subtracting fractions

In the ahead lessons, girlfriend learned that a fraction is part of a whole. Fractions display how much you have actually of something, prefer 1/2 of a tank that gas or 1/3 the a cup that water.

You are watching: 1/3 plus 1/3 equals

In real life, you might need to add or subtract fractions. Because that example, have you ever before walked 1/2 of a mile come work and then walked another 1/2 mile back? Or drained 1/4 that a quart of gas native a gas tank that had 3/4 that a quart in it? You probably didn't think about it in ~ the time, however these are instances of adding and subtracting fractions.

Click with the slideshow to learn just how to set up addition and subtraction problems with fractions.

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Let's imagine the a cake recipe speak you to add 3/5 of a cup of oil come the batter.

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You additionally need 1/5 that a cup the oil to grease the pan. To see just how much oil you'll require total, you have the right to add this fractions together.

When you include fractions, girlfriend just add the top numbers, or numerators.

That's since the bottom numbers, or denominators, present how numerous parts would certainly make a whole.

We don't want to adjust how countless parts do a totality cup (5). We simply want to discover out how numerous parts we need total.

So we only require to add the molecule of ours fractions.

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We can stack the fractions so the numerators space lined up. This will make it less complicated to add them.

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And that's every we need to do to collection up an enhancement example v fractions. Our fractions are currently ready to be added.

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We'll carry out the same thing to collection up a subtraction example. Let's speak you had actually 3/4 of a tank the gas once you gained to work.

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If you use 1/4 that a tank to journey home, how much will certainly you have actually left? We have the right to subtract these fractions to find out.

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Just like as soon as we added, we'll stack our fractions to store the numerators lined up.

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This is due to the fact that we want to subtract 1 component from 3 parts.

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Now that our instance is collection up, we're ready to subtract!

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Try This!

Try setting up these addition and subtraction problems with fractions. Don't try solving them yet!