Algebraic Techniques (HSC SSCE Mathematics Advanced): Quizzes

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Algebraic Fractions
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What makes x+23\frac{x+2}{3} an algebraic fraction?

It contains algebraic expressions

What is the golden rule for working with algebraic fractions?

Treat them like numerical fractions

Why can't you cancel xx in x+2x+5\frac{x+2}{x+5}?

xx is a term, not a factor

What should you do first when simplifying algebraic fractions?

Factorise completely

What is 2x3×9x\frac{2x}{3} \times \frac{9}{x}?

66

To divide ab÷cd\frac{a}{b} \div \frac{c}{d}, what do you do?

Flip second fraction then multiply

When dividing by 3x\frac{3}{x}, which fraction do you flip?

The second fraction only

How do you add 1x+2x\frac{1}{x} + \frac{2}{x}?

Add numerators, keep denominator

What must you do before adding 1x+1y\frac{1}{x} + \frac{1}{y}?

Find common denominator

What is the common denominator for 1x\frac{1}{x} and 1x+1\frac{1}{x+1}?

x(x+1)x(x+1)

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