Keystones — Capstone
Five GCSE retrieval questions · 29 November 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √320
Answer: 8√5 -
2. Algebra Completing the square
Complete the square: 3x² - 12x + 8
Answer: 3(x - 2)² - 4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 19cm, b = 14cm, angle = 50°. Give your answer to 2 decimal places
Answer: 101.88cm² -
4. Ratio Combining two ratios
a:b is 6:5 and b:c is 8:3. Find a:b:c in its simplest form.
Answer: 48:40:15 -
5. Statistics Averages and range
Find the mean, median and range of: 35, 29, 72, 81, 88, 53, 73. Give your answer to 2 decimal places
Answer: Mean = 61.57, Median = 72, Range = 59