Keystones — Capstone
Five GCSE retrieval questions · 25 July 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 4√176
Answer: 16√11 -
2. Algebra Completing the square
Complete the square: x² - 11x + 3
Answer: (x - 11⁄2)² - 109⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 13cm, b = 26cm, angle = 45°. Give your answer to 2 decimal places
Answer: 119.5cm² -
4. Ratio Combining two ratios
a:b is 9:2 and b:c is 7:4. Find a:b:c in its simplest form.
Answer: 63:14:8 -
5. Statistics Averages and range
Find the mean, median and range of: 41, 50, 100, 13, 93, 85, 71, 35, 45. Give your answer to 2 decimal places
Answer: Mean = 59.22, Median = 50, Range = 87