Keystones — Capstone
Five GCSE retrieval questions · 22 November 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √240
Answer: 4√15 -
2. Algebra Completing the square
Complete the square: 4x² - 16x + 15
Answer: 4(x - 2)² - 1 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 13cm, b = 26cm, angle = 69°. Give your answer to 2 decimal places
Answer: 157.78cm² -
4. Ratio Combining two ratios
a:b is 1:7 and b:c is 8:7. Find a:b:c in its simplest form.
Answer: 8:56:49 -
5. Statistics Averages and range
Find the mean, median and range of: 49, 26, 96, 25, 65, 39, 60, 17, 42. Give your answer to 2 decimal places
Answer: Mean = 46.56, Median = 42, Range = 79