Keystones — Capstone
Five GCSE retrieval questions · 19 January 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 3√175
Answer: 15√7 -
2. Algebra Completing the square
Complete the square: x² - 3x + 4
Answer: (x - 3⁄2)² + 7⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 27cm, b = 30cm, angle = 62°. Give your answer to 2 decimal places
Answer: 357.59cm² -
4. Ratio Combining two ratios
a:b is 9:8 and b:c is 9:1. Find a:b:c in its simplest form.
Answer: 81:72:8 -
5. Statistics Averages and range
Find the mean, median and range of: 49, 63, 86, 93, 51, 71, 77
Answer: Mean = 70, Median = 71, Range = 44