Keystones — Capstone
Five GCSE retrieval questions · 30 March 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √336
Answer: 4√21 -
2. Algebra Completing the square
Complete the square: 5x² - 10x + 9
Answer: 5(x - 1)² + 4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 18cm, b = 18cm, angle = 47°. Give your answer to 2 decimal places
Answer: 118.48cm² -
4. Ratio Combining two ratios
a:b is 1:3 and b:c is 2:5. Find a:b:c in its simplest form.
Answer: 2:6:15 -
5. Statistics Averages and range
Find the mean, median and range of: 68, 14, 47, 15, 86, 31, 94, 95, 53. Give your answer to 2 decimal places
Answer: Mean = 55.89, Median = 53, Range = 81