Keystones — Capstone
Five GCSE retrieval questions · 18 September 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √150
Answer: 5√6 -
2. Algebra Completing the square
Complete the square: x² + x + 1
Answer: (x + 1⁄2)² + 3⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 20cm, b = 28cm, angle = 54°. Give your answer to 2 decimal places
Answer: 226.52cm² -
4. Ratio Combining two ratios
a:b is 1:6 and b:c is 4:9. Find a:b:c in its simplest form.
Answer: 2:12:27 -
5. Statistics Averages and range
Find the mean, median and range of: 53, 79, 31, 38, 35, 40, 87, 99, 26. Give your answer to 2 decimal places
Answer: Mean = 54.22, Median = 40, Range = 73