Keystones — Capstone
Five GCSE retrieval questions · 7 December 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √180
Answer: 6√5 -
2. Algebra Completing the square
Complete the square: 5x² - 10x + 15
Answer: 5(x - 1)² + 10 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 25cm, b = 16cm, angle = 62°. Give your answer to 2 decimal places
Answer: 176.59cm² -
4. Ratio Combining two ratios
a:b is 2:9 and b:c is 7:2. Find a:b:c in its simplest form.
Answer: 14:63:18 -
5. Statistics Averages and range
Find the mean, median and range of: 12, 46, 22, 94, 17, 32, 15, 32
Answer: Mean = 33.75, Median = 27, Range = 82