Keystones — Capstone
Five GCSE retrieval questions · 8 May 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √960
Answer: 8√15 -
2. Algebra Completing the square
Complete the square: 2x² + 20x + 1
Answer: 2(x + 5)² - 49 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 15cm, b = 24cm, angle = 42°. Give your answer to 2 decimal places
Answer: 120.44cm² -
4. Ratio Combining two ratios
a:b is 3:2 and b:c is 7:3. Find a:b:c in its simplest form.
Answer: 21:14:6 -
5. Statistics Averages and range
Find the mean, median and range of: 23, 61, 58, 10, 17, 46, 65
Answer: Mean = 40, Median = 46, Range = 55