Keystones — Capstone
Five GCSE retrieval questions · 1 October 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √375
Answer: 5√15 -
2. Algebra Completing the square
Complete the square: x² + 5x + 9
Answer: (x + 5⁄2)² + 11⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 16cm, b = 22cm, angle = 66°. Give your answer to 2 decimal places
Answer: 160.78cm² -
4. Ratio Combining two ratios
a:b is 7:4 and b:c is 5:2. Find a:b:c in its simplest form.
Answer: 35:20:8 -
5. Statistics Averages and range
Find the mean, median and range of: 78, 70, 82, 97, 44, 79, 40
Answer: Mean = 70, Median = 78, Range = 57