Higher Maths revision

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  • Created by: Elca
  • Created on: 10-06-15 22:32

Estimating answers to number calculations

20.59 x 4.38 / 0.47 = 20 x 4 / 0.5 = 80 / 0.5

80 x 2 = 160

2.9 + 3.2 = 3 + 3 = 6 

0.2 x 5.4 = 1 

20.4 x 7.7 / 5.2 = 20 x 8 / 5 = 160 / 5 = 32

1 of 3

Maximum and minimum values

£53 to the nearest pound 

minimum = £52.50 

maximum = £53.50

10cm to the nearest cm

minimum = 9.5cm

maximum = 10.5cm 

15.8mm to the nearest mm 

minimum = 15.75mm

maximum = 15.85mm

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Solving harder equations

Equation containing a bracket

8 - 2 (z + 3) = 5 - 3z

8 - 2z - 6 = 5 - 3z 

2 + z = 5 

z = 3 

Equation containing a fraction

2p / 3 = 7 - p / 2 

2p = 21 - 3p / 2 

7p = 42

p = 42 / 7 

p = 6

3 of 3

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