Keystones — Capstone
Five GCSE retrieval questions · 1 October 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 5√250
Answer: 25√10 -
2. Algebra Completing the square
Complete the square: 2x² - 20x + 12
Answer: 2(x - 5)² - 38 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 29cm, b = 13cm, angle = 79°. Give your answer to 2 decimal places
Answer: 185.04cm² -
4. Ratio Combining two ratios
a:b is 2:9 and b:c is 6:5. Find a:b:c in its simplest form.
Answer: 4:18:15 -
5. Statistics Averages and range
Find the mean, median and range of: 100, 34, 14, 68, 78, 42, 72, 38
Answer: Mean = 55.75, Median = 55, Range = 86