Keystones — Capstone
Five GCSE retrieval questions · 25 February 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 3√175
Answer: 15√7 -
2. Algebra Completing the square
Complete the square: x² + 11x + 4
Answer: (x + 11⁄2)² - 105⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 24cm, b = 12cm, angle = 48°. Give your answer to 2 decimal places
Answer: 107.01cm² -
4. Ratio Combining two ratios
a:b is 1:7 and b:c is 9:1. Find a:b:c in its simplest form.
Answer: 9:63:7 -
5. Statistics Averages and range
Find the mean, median and range of: 68, 84, 25, 19, 22, 14, 20
Answer: Mean = 36, Median = 22, Range = 70