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8 Cards in this Set
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- Back
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Fractions
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Fractions - adding, subtracting, multiplying and dividing. ½ means 1 divided by 2. If you try this on a calculator, you will get an answer of 0.5 . 3/6 means 3 divided by 6. Using a calculator, you will find that this too gives an answer of 0.5 . That is because 1/2 = 3/6 = 0.5 . Fractions such as 3/6 can be cancelled. You can divide the top and bottom of the fraction by 3 to get 1/2 . |
With fractions, you are allowed to multiply or divide the top and bottom of the fraction by some number, as long as you multiply (or divide) everything on the top and everything on the bottom by that number. So 5/12 = 10/24 (multiplying top and bottom by 2).
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Division by Zero
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Division by ZeroAt this point, it is worth mentioning that you are not allowed to divide by zero. Division by zero is undefined. Some people think you can divide by zero and get infinity- you can't. Division by zero is simply not allowed.
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Adding and Subtracting Fractions |
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To add two fractions, the bottom (denominator) of the two fractions must be the same. 1/2 + 3/2 = 4/2 ; 1/10 + 3/10 + 5/10 = 9/10 . If the denominators are not the same, multiply the top and bottom of one (or more) of the fractions by a number to make the denominators the same.
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Example5 + 2 = 5 + 4 = 9 = 3 6 3 6 6 6 2 The same is true when subtracting fractions.
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Multiplying Fractions
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Multiplying FractionsThis is simple: just multiply the two numerators (top bits) together, and the two denominators together:2 × 5 = 10 = 5 3 8 24 12
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