Keystones — Capstone
Five GCSE retrieval questions · 1 March 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 5√48
Answer: 20√3 -
2. Algebra Completing the square
Complete the square: x² + 9x
Answer: (x + 9⁄2)² - 81⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 15cm, b = 16cm, angle = 69°. Give your answer to 2 decimal places
Answer: 112.03cm² -
4. Ratio Combining two ratios
a:b is 1:8 and b:c is 9:4. Find a:b:c in its simplest form.
Answer: 9:72:32 -
5. Statistics Averages and range
Find the mean, median and range of: 73, 28, 26, 53, 48, 81, 51. Give your answer to 2 decimal places
Answer: Mean = 51.43, Median = 51, Range = 55