Keystones — Capstone
Five GCSE retrieval questions · 14 April 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 3√8
Answer: 6√2 -
2. Algebra Completing the square
Complete the square: x² - 5x - 5
Answer: (x - 5⁄2)² - 45⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 29cm, b = 22cm, angle = 56°. Give your answer to 2 decimal places
Answer: 264.46cm² -
4. Ratio Combining two ratios
a:b is 5:4 and b:c is 6:1. Find a:b:c in its simplest form.
Answer: 15:12:2 -
5. Statistics Averages and range
Find the mean, median and range of: 33, 52, 97, 57, 95, 33, 14. Give your answer to 2 decimal places
Answer: Mean = 54.43, Median = 52, Range = 83