Keystones — Capstone
Five GCSE retrieval questions · 18 July 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 2√63
Answer: 6√7 -
2. Algebra Completing the square
Complete the square: 3x² - 6x + 13
Answer: 3(x - 1)² + 10 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 29cm, b = 25cm, angle = 79°. Give your answer to 2 decimal places
Answer: 355.84cm² -
4. Ratio Combining two ratios
a:b is 7:8 and b:c is 9:8. Find a:b:c in its simplest form.
Answer: 63:72:64 -
5. Statistics Averages and range
Find the mean, median and range of: 30, 27, 13, 25, 47, 67, 47, 86
Answer: Mean = 42.75, Median = 38.5, Range = 73