Keystones — Capstone
Five GCSE retrieval questions · 13 September 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √245
Answer: 7√5 -
2. Algebra Completing the square
Complete the square: x² - 3x + 11
Answer: (x - 3⁄2)² + 35⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 17cm, b = 21cm, angle = 68°. Give your answer to 2 decimal places
Answer: 165.5cm² -
4. Ratio Combining two ratios
a:b is 2:9 and b:c is 4:1. Find a:b:c in its simplest form.
Answer: 8:36:9 -
5. Statistics Averages and range
Find the mean, median and range of: 27, 99, 36, 26, 61, 48, 84. Give your answer to 2 decimal places
Answer: Mean = 54.43, Median = 48, Range = 73