Keystones — Capstone
Five GCSE retrieval questions · 8 October 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √224
Answer: 4√14 -
2. Algebra Completing the square
Complete the square: x² - 3x - 3
Answer: (x - 3⁄2)² - 21⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 26cm, b = 12cm, angle = 47°. Give your answer to 2 decimal places
Answer: 114.09cm² -
4. Ratio Combining two ratios
a:b is 1:9 and b:c is 6:7. Find a:b:c in its simplest form.
Answer: 2:18:21 -
5. Statistics Averages and range
Find the mean, median and range of: 55, 70, 69, 74, 96, 91, 57, 63, 61. Give your answer to 2 decimal places
Answer: Mean = 70.67, Median = 69, Range = 41