Keystones — Capstone
Five GCSE retrieval questions · 9 May 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √240
Answer: 4√15 -
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 = 18cm, b = 19cm, angle = 71°. Give your answer to 2 decimal places
Answer: 161.68cm² -
4. Ratio Combining two ratios
a:b is 8:3 and b:c is 5:3. Find a:b:c in its simplest form.
Answer: 40:15:9 -
5. Statistics Averages and range
Find the mean, median and range of: 30, 96, 63, 55, 56, 54, 74, 82
Answer: Mean = 63.75, Median = 59.5, Range = 66