Keystones — Capstone
Five GCSE retrieval questions · 1 October 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √504
Answer: 6√14 -
2. Algebra Completing the square
Complete the square: x² + 5x + 2
Answer: (x + 5⁄2)² - 17⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 21cm, b = 24cm, angle = 50°. Give your answer to 2 decimal places
Answer: 193.04cm² -
4. Ratio Combining two ratios
a:b is 1:3 and b:c is 8:5. Find a:b:c in its simplest form.
Answer: 8:24:15 -
5. Statistics Averages and range
Find the mean, median and range of: 70, 49, 52, 39, 19, 42, 73. Give your answer to 2 decimal places
Answer: Mean = 49.14, Median = 49, Range = 54