Cross Multiplication. 4x + 16 = ……………...

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Presentation transcript:

Cross Multiplication. 4x + 16 = ……………..

Cross Multiplying Fractions. Consider the fractions below: To cross multiply we multiply across the equal sign as shown by the arrows: 3 x 8 = 4 x 6 24 = 24 Now try these ones yourself. (1) (3) (2) 18 = 18 70 = 70 48 = 48

Equation Solving We can now use the cross multiplication technique to solve equations. Solve: (1) Cross multiply the equation. (2) Solve as normal. 8x = 4 x 6 24 x = 8 The answer is telling you that three quarters is the same as six eighths. x = 3

Further Example. 6y 7 x 8 = y = 56 6 y = y = Solve : (1) Cross multiply the y term first. (2) Solve as normal. 6y 7 x 8 = y = 56 6 y = y =

What Goes in The Box ? Solve the following equations using cross multiplication. (1) (4) x = 2 (2) (5) w = 12 (3) (6) f = 14