Keystones — Capstone
Five GCSE retrieval questions · 23 December 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √375
Answer: 5√15 -
2. Algebra Completing the square
Complete the square: x² - 11x + 5
Answer: (x - 11⁄2)² - 101⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 16cm, b = 22cm, angle = 42°. Give your answer to 2 decimal places
Answer: 117.77cm² -
4. Ratio Combining two ratios
a:b is 5:6 and b:c is 8:1. Find a:b:c in its simplest form.
Answer: 20:24:3 -
5. Statistics Averages and range
Find the mean, median and range of: 68, 70, 64, 35, 69, 54, 15, 52. Give your answer to 2 decimal places
Answer: Mean = 53.38, Median = 59, Range = 55