Keystones — Capstone
Five GCSE retrieval questions · 25 April 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 5√28
Answer: 10√7 -
2. Algebra Completing the square
Complete the square: x² + 7x - 8
Answer: (x + 7⁄2)² - 81⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 13cm, b = 17cm, angle = 52°. Give your answer to 2 decimal places
Answer: 87.08cm² -
4. Ratio Combining two ratios
a:b is 1:4 and b:c is 6:1. Find a:b:c in its simplest form.
Answer: 3:12:2 -
5. Statistics Averages and range
Find the mean, median and range of: 11, 11, 80, 18, 99, 35, 17, 27
Answer: Mean = 37.25, Median = 22.5, Range = 88