TenMarks teaches you how to add fractions with this simple exercise.
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Learn about Adding Like Fractions In this lesson, let’s learn how we add like fractions, like fractions re two fractions like 1/8 and 4/8 which have the same denominator. If they have the same denominator, they are called like fractions. How do we do this, well part A of the problem says we need to add 3/8 + 2/8, well these are like fractions because they have the same denominator. Here’s the way I’m going to explain this to you, first, we’re going to take a circle or a pie and take two parts of it, that’s, 2/8 right so this is 2/8. Then we/re going to take the same circle and have 3 parts of the 8 parts. So divided the circle into eight parts, here we’re showing two parts; here we’re showing three parts. If I was to add them, I would get five parts, one, two, three, four, five right. We’ve got three parts and two parts so we get five parts out of eight. So that’s exactly what we do here. In order to add two fractions that have the same denominator, what do we do, we add the numerators, if denominators are the same, we add the numerators, 3 and 2 gives me 5. That’s what we do. We add the numerators by just simply adding them 3 and 2 and the denominator because it’s the same, it gets copied over. Let’s try another problem, it says one bunch of grapes weight 3/8 pounds, another weighs 1/8 pounds. How much do they weigh together? Well I have to add 3/8 with 1/8, that’s the pound right. So these have the denominator, so what do I do? I add the numerator. 3 and 1 is 4. So they weight 4/8 pounds or since they have a greatest common factor of four, I can divide both sides by 4 to get 4/4 is 1, 8/4 is 2 or 1/2. Both of these would be correct, 1/2 pound is correct and 4/8 pounds is also correct.