Keystones — Capstone
Five GCSE retrieval questions · 24 November 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √539
Answer: 7√11 -
2. Algebra Completing the square
Complete the square: x² + 5x - 1
Answer: (x + 5⁄2)² - 29⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 13cm, b = 22cm, angle = 42°. Give your answer to 2 decimal places
Answer: 95.69cm² -
4. Ratio Combining two ratios
a:b is 6:7 and b:c is 2:7. Find a:b:c in its simplest form.
Answer: 12:14:49 -
5. Statistics Averages and range
Find the mean, median and range of: 34, 19, 61, 64, 10, 94, 48. Give your answer to 2 decimal places
Answer: Mean = 47.14, Median = 48, Range = 84