Keystones — Capstone
Five GCSE retrieval questions · 29 January 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √325
Answer: 5√13 -
2. Algebra Completing the square
Complete the square: x² - 7x + 12
Answer: (x - 7⁄2)² - 1⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 13cm, b = 20cm, angle = 73°. Give your answer to 2 decimal places
Answer: 124.32cm² -
4. Ratio Combining two ratios
a:b is 7:4 and b:c is 6:1. Find a:b:c in its simplest form.
Answer: 21:12:2 -
5. Statistics Averages and range
Find the mean, median and range of: 29, 34, 36, 64, 98, 62, 54, 49
Answer: Mean = 53.25, Median = 51.5, Range = 69