Keystones — Capstone
Five GCSE retrieval questions · 3 December 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √486
Answer: 9√6 -
2. Algebra Completing the square
Complete the square: x² - 7x + 9
Answer: (x - 7⁄2)² - 13⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 12cm, b = 16cm, angle = 41°. Give your answer to 2 decimal places
Answer: 62.98cm² -
4. Ratio Combining two ratios
a:b is 4:7 and b:c is 5:1. Find a:b:c in its simplest form.
Answer: 20:35:7 -
5. Statistics Averages and range
Find the mean, median and range of: 30, 40, 95, 85, 41, 99, 51
Answer: Mean = 63, Median = 51, Range = 69