Keystones — Capstone
Five GCSE retrieval questions · 19 August 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √700
Answer: 10√7 -
2. Algebra Completing the square
Complete the square: x² + x - 4
Answer: (x + 1⁄2)² - 17⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 27cm, b = 13cm, angle = 64°. Give your answer to 2 decimal places
Answer: 157.74cm² -
4. Ratio Combining two ratios
a:b is 7:2 and b:c is 5:4. Find a:b:c in its simplest form.
Answer: 35:10:8 -
5. Statistics Averages and range
Find the mean, median and range of: 86, 55, 92, 82, 45, 33, 58, 24, 43. Give your answer to 2 decimal places
Answer: Mean = 57.56, Median = 55, Range = 68