Keystones — Capstone
Five GCSE retrieval questions · 7 December 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √550
Answer: 5√22 -
2. Algebra Completing the square
Complete the square: 3x² + 36x - 14
Answer: 3(x + 6)² - 122 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 30cm, b = 16cm, angle = 64°. Give your answer to 2 decimal places
Answer: 215.71cm² -
4. Ratio Combining two ratios
a:b is 9:2 and b:c is 3:2. Find a:b:c in its simplest form.
Answer: 27:6:4 -
5. Statistics Averages and range
Find the mean, median and range of: 13, 56, 60, 58, 63, 84, 30, 65, 55. Give your answer to 2 decimal places
Answer: Mean = 53.78, Median = 58, Range = 71