Keystones — Capstone
Five GCSE retrieval questions · 2 April 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 3√99
Answer: 9√11 -
2. Algebra Completing the square
Complete the square: x² + 7x + 2
Answer: (x + 7⁄2)² - 41⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 21cm, b = 29cm, angle = 46°. Give your answer to 2 decimal places
Answer: 219.04cm² -
4. Ratio Combining two ratios
a:b is 1:7 and b:c is 4:3. Find a:b:c in its simplest form.
Answer: 4:28:21 -
5. Statistics Averages and range
Find the mean, median and range of: 76, 21, 10, 71, 68, 13, 47. Give your answer to 2 decimal places
Answer: Mean = 43.71, Median = 47, Range = 66