Keystones — Capstone
Five GCSE retrieval questions · 30 December 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √250
Answer: 5√10 -
2. Algebra Completing the square
Complete the square: x² + 3x + 5
Answer: (x + 3⁄2)² + 11⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 26cm, b = 13cm, angle = 49°. Give your answer to 2 decimal places
Answer: 127.55cm² -
4. Ratio Combining two ratios
a:b is 1:4 and b:c is 5:6. Find a:b:c in its simplest form.
Answer: 5:20:24 -
5. Statistics Averages and range
Find the mean, median and range of: 20, 30, 90, 32, 36, 66, 91, 51, 43
Answer: Mean = 51, Median = 43, Range = 71