Keystones — Capstone
Five GCSE retrieval questions · 7 May 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √792
Answer: 6√22 -
2. Algebra Completing the square
Complete the square: 2x² + 24x + 8
Answer: 2(x + 6)² - 64 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 13cm, b = 13cm, angle = 71°. Give your answer to 2 decimal places
Answer: 79.9cm² -
4. Ratio Combining two ratios
a:b is 1:7 and b:c is 9:8. Find a:b:c in its simplest form.
Answer: 9:63:56 -
5. Statistics Averages and range
Find the mean, median and range of: 61, 78, 51, 56, 95, 14, 91, 88
Answer: Mean = 66.75, Median = 69.5, Range = 81