Keystones — Capstone
Five GCSE retrieval questions · 11 February 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √960
Answer: 8√15 -
2. Algebra Completing the square
Complete the square: x² - 7x + 4
Answer: (x - 7⁄2)² - 33⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 16cm, b = 13cm, angle = 46°. Give your answer to 2 decimal places
Answer: 74.81cm² -
4. Ratio Combining two ratios
a:b is 4:5 and b:c is 6:1. Find a:b:c in its simplest form.
Answer: 24:30:5 -
5. Statistics Averages and range
Find the mean, median and range of: 98, 69, 34, 79, 12, 79, 19, 36
Answer: Mean = 53.25, Median = 52.5, Range = 86