Keystones — Capstone
Five GCSE retrieval questions · 16 October 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 2√20
Answer: 4√5 -
2. Algebra Completing the square
Complete the square: 2x² - 4x - 13
Answer: 2(x - 1)² - 15 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 14cm, b = 21cm, angle = 61°. Give your answer to 2 decimal places
Answer: 128.57cm² -
4. Ratio Combining two ratios
a:b is 3:5 and b:c is 3:1. Find a:b:c in its simplest form.
Answer: 9:15:5 -
5. Statistics Averages and range
Find the mean, median and range of: 15, 74, 31, 16, 63, 34, 86, 97
Answer: Mean = 52, Median = 48.5, Range = 82