Keystones — Capstone
Five GCSE retrieval questions · 29 October 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √960
Answer: 8√15 -
2. Algebra Completing the square
Complete the square: x² - 3x - 5
Answer: (x - 3⁄2)² - 29⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 24cm, b = 24cm, angle = 49°. Give your answer to 2 decimal places
Answer: 217.36cm² -
4. Ratio Combining two ratios
a:b is 6:5 and b:c is 9:2. Find a:b:c in its simplest form.
Answer: 54:45:10 -
5. Statistics Averages and range
Find the mean, median and range of: 10, 49, 61, 23, 89, 77, 58, 40. Give your answer to 2 decimal places
Answer: Mean = 50.88, Median = 53.5, Range = 79