Keystones — Capstone
Five GCSE retrieval questions · 25 September 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √75
Answer: 5√3 -
2. Algebra Completing the square
Complete the square: 2x² + 12x + 9
Answer: 2(x + 3)² - 9 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 13cm, b = 17cm, angle = 62°. Give your answer to 2 decimal places
Answer: 97.57cm² -
4. Ratio Combining two ratios
a:b is 5:7 and b:c is 5:3. Find a:b:c in its simplest form.
Answer: 25:35:21 -
5. Statistics Averages and range
Find the mean, median and range of: 47, 34, 13, 75, 39, 16, 51, 36. Give your answer to 2 decimal places
Answer: Mean = 38.88, Median = 37.5, Range = 62