Keystones — Capstone
Five GCSE retrieval questions · 8 February 2018 · 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 - 9x - 9
Answer: (x - 9⁄2)² - 117⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 30cm, b = 12cm, angle = 62°. Give your answer to 2 decimal places
Answer: 158.93cm² -
4. Ratio Combining two ratios
a:b is 3:5 and b:c is 2:5. Find a:b:c in its simplest form.
Answer: 6:10:25 -
5. Statistics Averages and range
Find the mean, median and range of: 11, 29, 27, 22, 88, 16, 51. Give your answer to 2 decimal places
Answer: Mean = 34.86, Median = 27, Range = 77