Keystones — Capstone
Five GCSE retrieval questions · 2 December 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 3√80
Answer: 12√5 -
2. Algebra Completing the square
Complete the square: x² + 3x - 10
Answer: (x + 3⁄2)² - 49⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 15cm, b = 27cm, angle = 65°. Give your answer to 2 decimal places
Answer: 183.53cm² -
4. Ratio Combining two ratios
a:b is 3:4 and b:c is 7:4. Find a:b:c in its simplest form.
Answer: 21:28:16 -
5. Statistics Averages and range
Find the mean, median and range of: 93, 42, 46, 12, 30, 88, 62, 56, 16. Give your answer to 2 decimal places
Answer: Mean = 49.44, Median = 46, Range = 81