Keystones — Capstone
Five GCSE retrieval questions · 18 October 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 2√80
Answer: 8√5 -
2. Algebra Completing the square
Complete the square: x² - 5x + 11
Answer: (x - 5⁄2)² + 19⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 19cm, b = 19cm, angle = 52°. Give your answer to 2 decimal places
Answer: 142.24cm² -
4. Ratio Combining two ratios
a:b is 1:7 and b:c is 3:5. Find a:b:c in its simplest form.
Answer: 3:21:35 -
5. Statistics Averages and range
Find the mean, median and range of: 26, 95, 47, 10, 88, 36, 74. Give your answer to 2 decimal places
Answer: Mean = 53.71, Median = 47, Range = 85