Keystones — Capstone
Five GCSE retrieval questions · 14 December 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 3√18
Answer: 9√2 -
2. Algebra Completing the square
Complete the square: 2x² + 4x - 13
Answer: 2(x + 1)² - 15 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 24cm, b = 15cm, angle = 80°. Give your answer to 2 decimal places
Answer: 177.27cm² -
4. Ratio Combining two ratios
a:b is 9:2 and b:c is 3:8. Find a:b:c in its simplest form.
Answer: 27:6:16 -
5. Statistics Averages and range
Find the mean, median and range of: 64, 21, 49, 95, 12, 83, 74, 12
Answer: Mean = 51.25, Median = 56.5, Range = 83