Keystones — Capstone
Five GCSE retrieval questions · 12 December 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √32
Answer: 4√2 -
2. Algebra Completing the square
Complete the square: x² + 7x - 2
Answer: (x + 7⁄2)² - 57⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 12cm, b = 16cm, angle = 66°. Give your answer to 2 decimal places
Answer: 87.7cm² -
4. Ratio Combining two ratios
a:b is 9:8 and b:c is 9:4. Find a:b:c in its simplest form.
Answer: 81:72:32 -
5. Statistics Averages and range
Find the mean, median and range of: 85, 19, 100, 53, 76, 53, 56. Give your answer to 2 decimal places
Answer: Mean = 63.14, Median = 56, Range = 81