Keystones — Capstone
Five GCSE retrieval questions · 4 March 2018 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √224
Answer: 4√14 -
2. Algebra Completing the square
Complete the square: 3x² - 24x - 13
Answer: 3(x - 4)² - 61 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 12cm, b = 27cm, angle = 59°. Give your answer to 2 decimal places
Answer: 138.86cm² -
4. Ratio Combining two ratios
a:b is 2:5 and b:c is 9:2. Find a:b:c in its simplest form.
Answer: 18:45:10 -
5. Statistics Averages and range
Find the mean, median and range of: 79, 32, 40, 50, 56, 11, 31, 64. Give your answer to 2 decimal places
Answer: Mean = 45.38, Median = 45, Range = 68