Keystones — Capstone
Five GCSE retrieval questions · 12 April 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √96
Answer: 4√6 -
2. Algebra Completing the square
Complete the square: x² + 7x - 3
Answer: (x + 7⁄2)² - 61⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 15cm, b = 16cm, angle = 80°. Give your answer to 2 decimal places
Answer: 118.18cm² -
4. Ratio Combining two ratios
a:b is 4:3 and b:c is 8:5. Find a:b:c in its simplest form.
Answer: 32:24:15 -
5. Statistics Averages and range
Find the mean, median and range of: 60, 84, 55, 16, 84, 81, 58, 47, 19
Answer: Mean = 56, Median = 58, Range = 68