Keystones — Capstone
Five GCSE retrieval questions · 5 December 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √112
Answer: 4√7 -
2. Algebra Completing the square
Complete the square: 2x² + 4x - 5
Answer: 2(x + 1)² - 7 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 16cm, b = 28cm, angle = 53°. Give your answer to 2 decimal places
Answer: 178.89cm² -
4. Ratio Combining two ratios
a:b is 5:9 and b:c is 4:5. Find a:b:c in its simplest form.
Answer: 20:36:45 -
5. Statistics Averages and range
Find the mean, median and range of: 20, 14, 99, 95, 38, 66, 37, 31
Answer: Mean = 50, Median = 37.5, Range = 85