Keystones — Capstone
Five GCSE retrieval questions · 7 February 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √425
Answer: 5√17 -
2. Algebra Completing the square
Complete the square: x² - 11x + 5
Answer: (x - 11⁄2)² - 101⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 19cm, b = 14cm, angle = 70°. Give your answer to 2 decimal places
Answer: 124.98cm² -
4. Ratio Combining two ratios
a:b is 3:7 and b:c is 8:3. Find a:b:c in its simplest form.
Answer: 24:56:21 -
5. Statistics Averages and range
Find the mean, median and range of: 97, 62, 18, 61, 52, 73, 22
Answer: Mean = 55, Median = 61, Range = 79