Keystones — Capstone
Five GCSE retrieval questions · 7 June 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √112
Answer: 4√7 -
2. Algebra Completing the square
Complete the square: x² - 9x - 5
Answer: (x - 9⁄2)² - 101⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 15cm, b = 21cm, angle = 71°. Give your answer to 2 decimal places
Answer: 148.92cm² -
4. Ratio Combining two ratios
a:b is 9:4 and b:c is 6:1. Find a:b:c in its simplest form.
Answer: 27:12:2 -
5. Statistics Averages and range
Find the mean, median and range of: 62, 56, 84, 39, 80, 75, 72. Give your answer to 2 decimal places
Answer: Mean = 66.86, Median = 72, Range = 45