Keystones — Capstone
Five GCSE retrieval questions · 12 November 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √612
Answer: 6√17 -
2. Algebra Completing the square
Complete the square: 5x² - 30x + 12
Answer: 5(x - 3)² - 33 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 22cm, b = 13cm, angle = 54°. Give your answer to 2 decimal places
Answer: 115.69cm² -
4. Ratio Combining two ratios
a:b is 7:4 and b:c is 3:1. Find a:b:c in its simplest form.
Answer: 21:12:4 -
5. Statistics Averages and range
Find the mean, median and range of: 20, 61, 35, 20, 49, 94, 74, 32. Give your answer to 2 decimal places
Answer: Mean = 48.13, Median = 42, Range = 74