Keystones — Capstone
Five GCSE retrieval questions · 23 November 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √486
Answer: 9√6 -
2. Algebra Completing the square
Complete the square: 5x² - 60x - 5
Answer: 5(x - 6)² - 185 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 16cm, b = 29cm, angle = 50°. Give your answer to 2 decimal places
Answer: 177.72cm² -
4. Ratio Combining two ratios
a:b is 2:5 and b:c is 4:1. Find a:b:c in its simplest form.
Answer: 8:20:5 -
5. Statistics Averages and range
Find the mean, median and range of: 59, 39, 44, 48, 37, 38, 87, 39, 78. Give your answer to 2 decimal places
Answer: Mean = 52.11, Median = 44, Range = 50