Keystones — Capstone
Five GCSE retrieval questions · 17 May 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 5√176
Answer: 20√11 -
2. Algebra Completing the square
Complete the square: x² + 3x + 12
Answer: (x + 3⁄2)² + 39⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 18cm, b = 13cm, angle = 80°. Give your answer to 2 decimal places
Answer: 115.22cm² -
4. Ratio Combining two ratios
a:b is 9:7 and b:c is 8:5. Find a:b:c in its simplest form.
Answer: 72:56:35 -
5. Statistics Averages and range
Find the mean, median and range of: 64, 86, 51, 58, 63, 36, 81, 46. Give your answer to 2 decimal places
Answer: Mean = 60.63, Median = 60.5, Range = 50