Keystones — Capstone
Five GCSE retrieval questions · 1 March 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 3√160
Answer: 12√10 -
2. Algebra Completing the square
Complete the square: 5x² + 60x - 1
Answer: 5(x + 6)² - 181 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 13cm, b = 28cm, angle = 57°. Give your answer to 2 decimal places
Answer: 152.64cm² -
4. Ratio Combining two ratios
a:b is 1:7 and b:c is 8:9. Find a:b:c in its simplest form.
Answer: 8:56:63 -
5. Statistics Averages and range
Find the mean, median and range of: 27, 20, 84, 10, 40, 20, 18. Give your answer to 2 decimal places
Answer: Mean = 31.29, Median = 20, Range = 74