# Number

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How do you add or subtract fractions?
Make the denominator (bottom number) the same, then add/subtract top numbers
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How do you multiply fractions?
Multiply top by top and bottom by bottom
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How do you divide fractions?
Turn the second fraction upside down then multiply
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How do you answer a question about recurring decimals? (such as ... Prove that 0.24 recurring = 8/33)
Write the recurring decimal equal to n, then multiply it by either 10 (1 digit recurs) 100 (2 digits recur), 1000 (3), etc. Then subtract n to remove recurring bit, then divide both sides by 9, 99, 999 etc to make fraction, then simplify for answer
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Upper and lower bounds are a measure of accuracy, the lower bound is the minimum value something can be, the upper bound is the maximum value something can be. E.g. (Width of postcard is 8cm to nearest cm, so lower bound is 7.5cm, upper bound is 8.5c
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## Other cards in this set

### Card 2

#### Front

How do you multiply fractions?

#### Back

Multiply top by top and bottom by bottom

### Card 3

#### Front

How do you divide fractions?

### Card 4

#### Front

How do you answer a question about recurring decimals? (such as ... Prove that 0.24 recurring = 8/33)