Keystones — Capstone
Five GCSE retrieval questions · 2 June 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √72
Answer: 6√2 -
2. Algebra Completing the square
Complete the square: 2x² - 4x - 2
Answer: 2(x - 1)² - 4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 24cm, b = 12cm, angle = 48°. Give your answer to 2 decimal places
Answer: 107.01cm² -
4. Ratio Combining two ratios
a:b is 4:9 and b:c is 6:1. Find a:b:c in its simplest form.
Answer: 8:18:3 -
5. Statistics Averages and range
Find the mean, median and range of: 88, 99, 13, 46, 80, 79, 67, 54, 80. Give your answer to 2 decimal places
Answer: Mean = 67.33, Median = 79, Range = 86