Keystones — Capstone
Five GCSE retrieval questions · 28 December 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 5√80
Answer: 20√5 -
2. Algebra Completing the square
Complete the square: x² - 9x + 6
Answer: (x - 9⁄2)² - 57⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 26cm, b = 19cm, angle = 49°. Give your answer to 2 decimal places
Answer: 186.41cm² -
4. Ratio Combining two ratios
a:b is 2:3 and b:c is 8:7. Find a:b:c in its simplest form.
Answer: 16:24:21 -
5. Statistics Averages and range
Find the mean, median and range of: 86, 46, 33, 25, 43, 66, 19, 18
Answer: Mean = 42, Median = 38, Range = 68