Keystones — Capstone
Five GCSE retrieval questions · 30 August 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √475
Answer: 5√19 -
2. Algebra Completing the square
Complete the square: x² - 11x - 2
Answer: (x - 11⁄2)² - 129⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 13cm, b = 14cm, angle = 78°. Give your answer to 2 decimal places
Answer: 89.01cm² -
4. Ratio Combining two ratios
a:b is 2:7 and b:c is 3:2. Find a:b:c in its simplest form.
Answer: 6:21:14 -
5. Statistics Averages and range
Find the mean, median and range of: 25, 20, 64, 27, 89, 84, 72. Give your answer to 2 decimal places
Answer: Mean = 54.43, Median = 64, Range = 69