Keystones — Capstone
Five GCSE retrieval questions · 23 March 2016 · 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 + 3x + 3
Answer: (x + 3⁄2)² + 3⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 13cm, b = 25cm, angle = 54°. Give your answer to 2 decimal places
Answer: 131.47cm² -
4. Ratio Combining two ratios
a:b is 5:8 and b:c is 5:7. Find a:b:c in its simplest form.
Answer: 25:40:56 -
5. Statistics Averages and range
Find the mean, median and range of: 80, 74, 21, 85, 56, 97, 64, 46. Give your answer to 2 decimal places
Answer: Mean = 65.38, Median = 69, Range = 76