Keystones — Capstone
Five GCSE retrieval questions · 21 May 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 4√90
Answer: 12√10 -
2. Algebra Completing the square
Complete the square: x² - x + 5
Answer: (x - 1⁄2)² + 19⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 20cm, b = 12cm, angle = 76°. Give your answer to 2 decimal places
Answer: 116.44cm² -
4. Ratio Combining two ratios
a:b is 1:9 and b:c is 7:8. Find a:b:c in its simplest form.
Answer: 7:63:72 -
5. Statistics Averages and range
Find the mean, median and range of: 63, 17, 40, 73, 40, 29, 93, 96, 71
Answer: Mean = 58, Median = 63, Range = 79