Keystones — Capstone
Five GCSE retrieval questions · 17 August 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √180
Answer: 6√5 -
2. Algebra Completing the square
Complete the square: x² - 11x
Answer: (x - 11⁄2)² - 121⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 27cm, b = 21cm, angle = 76°. Give your answer to 2 decimal places
Answer: 275.08cm² -
4. Ratio Combining two ratios
a:b is 9:4 and b:c is 9:2. Find a:b:c in its simplest form.
Answer: 81:36:8 -
5. Statistics Averages and range
Find the mean, median and range of: 24, 74, 51, 65, 26, 69, 18, 34. Give your answer to 2 decimal places
Answer: Mean = 45.13, Median = 42.5, Range = 56