Keystones — Capstone
Five GCSE retrieval questions · 1 May 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √960
Answer: 8√15 -
2. Algebra Completing the square
Complete the square: 2x² - 8x - 9
Answer: 2(x - 2)² - 17 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 28cm, b = 16cm, angle = 69°. Give your answer to 2 decimal places
Answer: 209.12cm² -
4. Ratio Combining two ratios
a:b is 9:4 and b:c is 7:6. Find a:b:c in its simplest form.
Answer: 63:28:24 -
5. Statistics Averages and range
Find the mean, median and range of: 29, 79, 32, 82, 30, 20, 14, 48
Answer: Mean = 41.75, Median = 31, Range = 68