Keystones — Capstone
Five GCSE retrieval questions · 25 June 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √128
Answer: 8√2 -
2. Algebra Completing the square
Complete the square: x² + 3x + 3
Answer: (x + 3⁄2)² + 3⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 24cm, b = 20cm, angle = 80°. Give your answer to 2 decimal places
Answer: 236.35cm² -
4. Ratio Combining two ratios
a:b is 5:7 and b:c is 9:7. Find a:b:c in its simplest form.
Answer: 45:63:49 -
5. Statistics Averages and range
Find the mean, median and range of: 52, 13, 71, 63, 97, 69, 78, 40. Give your answer to 2 decimal places
Answer: Mean = 60.38, Median = 66, Range = 84