Keystones — Capstone
Five GCSE retrieval questions · 19 February 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: 2x² - 12x - 15
Answer: 2(x - 3)² - 33 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 15cm, b = 14cm, angle = 56°. Give your answer to 2 decimal places
Answer: 87.05cm² -
4. Ratio Combining two ratios
a:b is 3:5 and b:c is 3:8. Find a:b:c in its simplest form.
Answer: 9:15:40 -
5. Statistics Averages and range
Find the mean, median and range of: 87, 23, 94, 100, 64, 78, 62. Give your answer to 2 decimal places
Answer: Mean = 72.57, Median = 78, Range = 77