Keystones — Capstone
Five GCSE retrieval questions · 1 February 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √891
Answer: 9√11 -
2. Algebra Completing the square
Complete the square: 2x² - 20x + 13
Answer: 2(x - 5)² - 37 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 20cm, b = 18cm, angle = 51°. Give your answer to 2 decimal places
Answer: 139.89cm² -
4. Ratio Combining two ratios
a:b is 2:3 and b:c is 4:7. Find a:b:c in its simplest form.
Answer: 8:12:21 -
5. Statistics Averages and range
Find the mean, median and range of: 37, 77, 12, 58, 44, 88, 29, 51, 53. Give your answer to 2 decimal places
Answer: Mean = 49.89, Median = 51, Range = 76