Keystones — Capstone
Five GCSE retrieval questions · 16 November 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √50
Answer: 5√2 -
2. Algebra Completing the square
Complete the square: 3x² - 24x - 12
Answer: 3(x - 4)² - 60 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 29cm, b = 16cm, angle = 42°. Give your answer to 2 decimal places
Answer: 155.24cm² -
4. Ratio Combining two ratios
a:b is 3:5 and b:c is 9:2. Find a:b:c in its simplest form.
Answer: 27:45:10 -
5. Statistics Averages and range
Find the mean, median and range of: 55, 92, 64, 34, 85, 66, 77. Give your answer to 2 decimal places
Answer: Mean = 67.57, Median = 66, Range = 58