Keystones — Capstone
Five GCSE retrieval questions · 27 December 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √240
Answer: 4√15 -
2. Algebra Completing the square
Complete the square: 5x² - 50x + 3
Answer: 5(x - 5)² - 122 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 21cm, b = 23cm, angle = 79°. Give your answer to 2 decimal places
Answer: 237.06cm² -
4. Ratio Combining two ratios
a:b is 6:7 and b:c is 2:3. Find a:b:c in its simplest form.
Answer: 12:14:21 -
5. Statistics Averages and range
Find the mean, median and range of: 46, 62, 20, 39, 99, 23, 42, 81
Answer: Mean = 51.5, Median = 44, Range = 79