Keystones — Capstone
Five GCSE retrieval questions · 5 April 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √612
Answer: 6√17 -
2. Algebra Completing the square
Complete the square: x² + 5x + 4
Answer: (x + 5⁄2)² - 9⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 26cm, b = 21cm, angle = 51°. Give your answer to 2 decimal places
Answer: 212.16cm² -
4. Ratio Combining two ratios
a:b is 1:4 and b:c is 9:2. Find a:b:c in its simplest form.
Answer: 9:36:8 -
5. Statistics Averages and range
Find the mean, median and range of: 42, 32, 71, 57, 10, 52, 37
Answer: Mean = 43, Median = 42, Range = 61