Keystones — Capstone
Five GCSE retrieval questions · 25 April 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 5√20
Answer: 10√5 -
2. Algebra Completing the square
Complete the square: x² - 9x + 7
Answer: (x - 9⁄2)² - 53⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 23cm, b = 18cm, angle = 53°. Give your answer to 2 decimal places
Answer: 165.32cm² -
4. Ratio Combining two ratios
a:b is 5:6 and b:c is 8:1. Find a:b:c in its simplest form.
Answer: 20:24:3 -
5. Statistics Averages and range
Find the mean, median and range of: 49, 41, 54, 98, 92, 97, 55, 57, 84. Give your answer to 2 decimal places
Answer: Mean = 69.67, Median = 57, Range = 57