Keystones — Capstone
Five GCSE retrieval questions · 24 March 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 2√27
Answer: 6√3 -
2. Algebra Completing the square
Complete the square: x² - 5x - 7
Answer: (x - 5⁄2)² - 53⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 19cm, b = 13cm, angle = 48°. Give your answer to 2 decimal places
Answer: 91.78cm² -
4. Ratio Combining two ratios
a:b is 3:4 and b:c is 3:1. Find a:b:c in its simplest form.
Answer: 9:12:4 -
5. Statistics Averages and range
Find the mean, median and range of: 35, 70, 35, 91, 37, 93, 84, 52. Give your answer to 2 decimal places
Answer: Mean = 62.13, Median = 61, Range = 58