Keystones — Capstone
Five GCSE retrieval questions · 4 August 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √325
Answer: 5√13 -
2. Algebra Completing the square
Complete the square: x² - x
Answer: (x - 1⁄2)² - 1⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 12cm, b = 24cm, angle = 65°. Give your answer to 2 decimal places
Answer: 130.51cm² -
4. Ratio Combining two ratios
a:b is 7:8 and b:c is 7:5. Find a:b:c in its simplest form.
Answer: 49:56:40 -
5. Statistics Averages and range
Find the mean, median and range of: 52, 68, 13, 61, 68, 52, 87, 16, 70. Give your answer to 2 decimal places
Answer: Mean = 54.11, Median = 61, Range = 74