Keystones — Capstone
Five GCSE retrieval questions · 21 July 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √550
Answer: 5√22 -
2. Algebra Completing the square
Complete the square: 5x² - 40x + 8
Answer: 5(x - 4)² - 72 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 16cm, b = 14cm, angle = 57°. Give your answer to 2 decimal places
Answer: 93.93cm² -
4. Ratio Combining two ratios
a:b is 3:8 and b:c is 6:1. Find a:b:c in its simplest form.
Answer: 9:24:4 -
5. Statistics Averages and range
Find the mean, median and range of: 68, 96, 40, 46, 64, 68, 66, 42
Answer: Mean = 61.25, Median = 65, Range = 56