Keystones — Capstone
Five GCSE retrieval questions · 19 May 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √250
Answer: 5√10 -
2. Algebra Completing the square
Complete the square: 2x² - 4x
Answer: 2(x - 1)² - 2 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 17cm, b = 14cm, angle = 72°. Give your answer to 2 decimal places
Answer: 113.18cm² -
4. Ratio Combining two ratios
a:b is 5:3 and b:c is 4:1. Find a:b:c in its simplest form.
Answer: 20:12:3 -
5. Statistics Averages and range
Find the mean, median and range of: 50, 78, 30, 61, 29, 19, 77, 31, 12
Answer: Mean = 43, Median = 31, Range = 66