Keystones — Capstone
Five GCSE retrieval questions · 24 August 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √125
Answer: 5√5 -
2. Algebra Completing the square
Complete the square: 2x² + 4x - 5
Answer: 2(x + 1)² - 7 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 17cm, b = 29cm, angle = 69°. Give your answer to 2 decimal places
Answer: 230.13cm² -
4. Ratio Combining two ratios
a:b is 9:2 and b:c is 7:8. Find a:b:c in its simplest form.
Answer: 63:14:16 -
5. Statistics Averages and range
Find the mean, median and range of: 24, 92, 76, 40, 37, 67, 98, 68
Answer: Mean = 62.75, Median = 67.5, Range = 74