Keystones — Capstone
Five GCSE retrieval questions · 20 June 2016 · 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 + 48x - 14
Answer: 4(x + 6)² - 158 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 24cm, b = 17cm, angle = 72°. Give your answer to 2 decimal places
Answer: 194.02cm² -
4. Ratio Combining two ratios
a:b is 2:7 and b:c is 5:3. Find a:b:c in its simplest form.
Answer: 10:35:21 -
5. Statistics Averages and range
Find the mean, median and range of: 13, 74, 30, 30, 95, 20, 45, 32, 74. Give your answer to 2 decimal places
Answer: Mean = 45.89, Median = 32, Range = 82