Keystones — Capstone
Five GCSE retrieval questions · 4 July 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √150
Answer: 5√6 -
2. Algebra Completing the square
Complete the square: 3x² + 36x + 13
Answer: 3(x + 6)² - 95 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 29cm, b = 26cm, angle = 50°. Give your answer to 2 decimal places
Answer: 288.8cm² -
4. Ratio Combining two ratios
a:b is 7:2 and b:c is 9:4. Find a:b:c in its simplest form.
Answer: 63:18:8 -
5. Statistics Averages and range
Find the mean, median and range of: 80, 97, 84, 26, 78, 78, 11, 83. Give your answer to 2 decimal places
Answer: Mean = 67.13, Median = 79, Range = 86