Keystones — Capstone
Five GCSE retrieval questions · 29 June 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 5√8
Answer: 10√2 -
2. Algebra Completing the square
Complete the square: x² - 3x + 12
Answer: (x - 3⁄2)² + 39⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 28cm, b = 12cm, angle = 60°. Give your answer to 2 decimal places
Answer: 145.49cm² -
4. Ratio Combining two ratios
a:b is 7:2 and b:c is 9:7. Find a:b:c in its simplest form.
Answer: 63:18:14 -
5. Statistics Averages and range
Find the mean, median and range of: 76, 11, 89, 66, 60, 88, 60, 21, 94. Give your answer to 2 decimal places
Answer: Mean = 62.78, Median = 66, Range = 83