Keystones — Capstone
Five GCSE retrieval questions · 20 April 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 2√80
Answer: 8√5 -
2. Algebra Completing the square
Complete the square: 4x² + 16x + 1
Answer: 4(x + 2)² - 15 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 30cm, b = 23cm, angle = 64°. Give your answer to 2 decimal places
Answer: 310.08cm² -
4. Ratio Combining two ratios
a:b is 6:7 and b:c is 8:1. Find a:b:c in its simplest form.
Answer: 48:56:7 -
5. Statistics Averages and range
Find the mean, median and range of: 63, 10, 23, 10, 53, 97, 43. Give your answer to 2 decimal places
Answer: Mean = 42.71, Median = 43, Range = 87