Keystones — Capstone
Five GCSE retrieval questions · 9 April 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √50
Answer: 5√2 -
2. Algebra Completing the square
Complete the square: 2x² - 24x - 14
Answer: 2(x - 6)² - 86 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 19cm, b = 28cm, angle = 63°. Give your answer to 2 decimal places
Answer: 237.01cm² -
4. Ratio Combining two ratios
a:b is 3:2 and b:c is 3:1. Find a:b:c in its simplest form.
Answer: 9:6:2 -
5. Statistics Averages and range
Find the mean, median and range of: 84, 54, 36, 84, 65, 95, 98, 100, 20. Give your answer to 2 decimal places
Answer: Mean = 70.67, Median = 84, Range = 80