Keystones — Capstone
Five GCSE retrieval questions · 9 December 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 3√150
Answer: 15√6 -
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 = 18cm, b = 28cm, angle = 57°. Give your answer to 2 decimal places
Answer: 211.34cm² -
4. Ratio Combining two ratios
a:b is 4:5 and b:c is 9:1. Find a:b:c in its simplest form.
Answer: 36:45:5 -
5. Statistics Averages and range
Find the mean, median and range of: 39, 94, 15, 72, 20, 49, 21, 42
Answer: Mean = 44, Median = 40.5, Range = 79