Keystones — Capstone
Five GCSE retrieval questions · 18 April 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √128
Answer: 8√2 -
2. Algebra Completing the square
Complete the square: 2x² - 20x + 13
Answer: 2(x - 5)² - 37 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 20cm, b = 30cm, angle = 70°. Give your answer to 2 decimal places
Answer: 281.91cm² -
4. Ratio Combining two ratios
a:b is 1:4 and b:c is 3:2. Find a:b:c in its simplest form.
Answer: 3:12:8 -
5. Statistics Averages and range
Find the mean, median and range of: 27, 77, 51, 89, 16, 26, 84, 21, 14
Answer: Mean = 45, Median = 27, Range = 75