Keystones — Capstone
Five GCSE retrieval questions · 11 November 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 3√48
Answer: 12√3 -
2. Algebra Completing the square
Complete the square: 3x² + 12x - 13
Answer: 3(x + 2)² - 25 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 19cm, b = 27cm, angle = 74°. Give your answer to 2 decimal places
Answer: 246.56cm² -
4. Ratio Combining two ratios
a:b is 4:3 and b:c is 5:1. Find a:b:c in its simplest form.
Answer: 20:15:3 -
5. Statistics Averages and range
Find the mean, median and range of: 26, 95, 57, 19, 86, 80, 85
Answer: Mean = 64, Median = 80, Range = 76