Keystones — Capstone
Five GCSE retrieval questions · 26 September 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 4√99
Answer: 12√11 -
2. Algebra Completing the square
Complete the square: x² - 5x + 2
Answer: (x - 5⁄2)² - 17⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 25cm, b = 16cm, angle = 58°. Give your answer to 2 decimal places
Answer: 169.61cm² -
4. Ratio Combining two ratios
a:b is 5:2 and b:c is 9:4. Find a:b:c in its simplest form.
Answer: 45:18:8 -
5. Statistics Averages and range
Find the mean, median and range of: 69, 32, 21, 20, 21, 16, 24
Answer: Mean = 29, Median = 21, Range = 53