Keystones — Capstone
Five GCSE retrieval questions · 22 March 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 2√8
Answer: 4√2 -
2. Algebra Completing the square
Complete the square: x² - 9x - 4
Answer: (x - 9⁄2)² - 97⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 24cm, b = 13cm, angle = 62°. Give your answer to 2 decimal places
Answer: 137.74cm² -
4. Ratio Combining two ratios
a:b is 4:5 and b:c is 4:3. Find a:b:c in its simplest form.
Answer: 16:20:15 -
5. Statistics Averages and range
Find the mean, median and range of: 56, 25, 56, 52, 62, 36, 99. Give your answer to 2 decimal places
Answer: Mean = 55.14, Median = 56, Range = 74