Keystones — Capstone
Five GCSE retrieval questions · 10 April 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √550
Answer: 5√22 -
2. Algebra Completing the square
Complete the square: 2x² - 24x - 3
Answer: 2(x - 6)² - 75 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 12cm, b = 18cm, angle = 51°. Give your answer to 2 decimal places
Answer: 83.93cm² -
4. Ratio Combining two ratios
a:b is 2:9 and b:c is 6:1. Find a:b:c in its simplest form.
Answer: 4:18:3 -
5. Statistics Averages and range
Find the mean, median and range of: 95, 59, 63, 36, 33, 99, 42, 33
Answer: Mean = 57.5, Median = 50.5, Range = 66