Get a welcome to the math Channel. What we're gonna be looking at in this video is a way of subtracting fractions from one another, fractions with different bottom numbers. We're gonna be looking at how to do this pretty much instantly, without all that messy working out that you often get with fractions. Once you work out how to do this trick, it's a really great and easy method of doing it. Let me give you an example. We'll answer it while I'm writing it down. 3/4 subtract 1/2. The answer should be 2/8, which can be simplified to 1/4. Now let me show you how to do this. First, let's get the bottom number. It's 4 times 2, which equals 8. Now, for the top number, we start on the left-hand side and multiply the top number by the number on the left, and the bottom number by the number on the right. Then, we subtract. 3 times 2 is 6, 1 times 4 is 4. 6 subtract 4 equals 2. Let's try another example. 1/2 subtract 2/5. Multiply the numbers to get the bottom number: 2 times 5 equals 10. Now, multiply the top number on the left by the number on the left, and the top number on the right by the number on the right. 1 times 5 is 5, and 2 times 2 is 4. Subtract 5 from 4 to get 1. Here's one more example. 4/5 subtract 2/3. Multiply 4 times 3 to get 12, and 2 times 5 to get 10. Subtract 10 from 12 to get 2. These are really easy methods for subtracting fractions. No need to find common denominators or do multiple lines of working out. It's pretty straightforward.
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