Keystones — Capstone
Five GCSE retrieval questions · 4 October 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √720
Answer: 12√5 -
2. Algebra Completing the square
Complete the square: x² - x + 3
Answer: (x - 1⁄2)² + 11⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 15cm, b = 24cm, angle = 42°. Give your answer to 2 decimal places
Answer: 120.44cm² -
4. Ratio Combining two ratios
a:b is 8:9 and b:c is 6:1. Find a:b:c in its simplest form.
Answer: 16:18:3 -
5. Statistics Averages and range
Find the mean, median and range of: 17, 41, 51, 56, 52, 38, 86. Give your answer to 2 decimal places
Answer: Mean = 48.71, Median = 51, Range = 69