Keystones — Capstone
Five GCSE retrieval questions · 20 October 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √931
Answer: 7√19 -
2. Algebra Completing the square
Complete the square: 2x² - 12x - 7
Answer: 2(x - 3)² - 25 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 13cm, b = 19cm, angle = 56°. Give your answer to 2 decimal places
Answer: 102.39cm² -
4. Ratio Combining two ratios
a:b is 3:8 and b:c is 7:4. Find a:b:c in its simplest form.
Answer: 21:56:32 -
5. Statistics Averages and range
Find the mean, median and range of: 67, 94, 29, 70, 90, 79, 10, 52, 61. Give your answer to 2 decimal places
Answer: Mean = 61.33, Median = 67, Range = 84