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10 cards from this deck
ab×cd=acbd\frac{a}{b} \times \frac{c}{d} = \frac{ac}{bd}ba×dc=bdac
Multiplying by its reciprocal
Fractions with algebraic expressions in numerator/denominator
Denominator equals zero
Factorise numerator and denominator completely
Cancel them
Lowest common denominator
ab÷cd=ab×dc\frac{a}{b} \div \frac{c}{d} = \frac{a}{b} \times \frac{d}{c}ba÷dc=ba×cd
Terms that are added or subtracted
ab+cb=a+cb\frac{a}{b} + \frac{c}{b} = \frac{a+c}{b}ba+bc=ba+c
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