Keystones — Capstone
Five GCSE retrieval questions · 11 September 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 2√24
Answer: 4√6 -
2. Algebra Completing the square
Complete the square: x² - 7x - 4
Answer: (x - 7⁄2)² - 65⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 27cm, b = 16cm, angle = 72°. Give your answer to 2 decimal places
Answer: 205.43cm² -
4. Ratio Combining two ratios
a:b is 4:7 and b:c is 4:1. Find a:b:c in its simplest form.
Answer: 16:28:7 -
5. Statistics Averages and range
Find the mean, median and range of: 43, 54, 77, 15, 76, 44, 64. Give your answer to 2 decimal places
Answer: Mean = 53.29, Median = 54, Range = 62