Keystones — Capstone
Five GCSE retrieval questions · 25 February 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: 2x² - 4x + 1
Answer: 2(x - 1)² - 1 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 13cm, b = 27cm, angle = 74°. Give your answer to 2 decimal places
Answer: 168.7cm² -
4. Ratio Combining two ratios
a:b is 1:2 and b:c is 9:8. Find a:b:c in its simplest form.
Answer: 9:18:16 -
5. Statistics Averages and range
Find the mean, median and range of: 32, 75, 19, 51, 66, 95, 51, 32, 23. Give your answer to 2 decimal places
Answer: Mean = 49.33, Median = 51, Range = 76