Keystones — Capstone
Five GCSE retrieval questions · 28 June 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √320
Answer: 8√5 -
2. Algebra Completing the square
Complete the square: x² - x + 10
Answer: (x - 1⁄2)² + 39⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 19cm, b = 16cm, angle = 67°. Give your answer to 2 decimal places
Answer: 139.92cm² -
4. Ratio Combining two ratios
a:b is 3:2 and b:c is 5:4. Find a:b:c in its simplest form.
Answer: 15:10:8 -
5. Statistics Averages and range
Find the mean, median and range of: 47, 42, 16, 46, 28, 67, 32. Give your answer to 2 decimal places
Answer: Mean = 39.71, Median = 42, Range = 51