Keystones — Capstone
Five GCSE retrieval questions · 1 January 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √931
Answer: 7√19 -
2. Algebra Completing the square
Complete the square: 3x² - 12x + 11
Answer: 3(x - 2)² - 1 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 20cm, b = 29cm, angle = 50°. Give your answer to 2 decimal places
Answer: 222.15cm² -
4. Ratio Combining two ratios
a:b is 5:9 and b:c is 5:2. Find a:b:c in its simplest form.
Answer: 25:45:18 -
5. Statistics Averages and range
Find the mean, median and range of: 71, 13, 96, 47, 60, 57, 84, 90, 45. Give your answer to 2 decimal places
Answer: Mean = 62.56, Median = 60, Range = 83