Keystones — Capstone
Five GCSE retrieval questions · 23 January 2018 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √208
Answer: 4√13 -
2. Algebra Completing the square
Complete the square: 2x² - 20x - 9
Answer: 2(x - 5)² - 59 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 18cm, b = 27cm, angle = 74°. Give your answer to 2 decimal places
Answer: 233.59cm² -
4. Ratio Combining two ratios
a:b is 1:5 and b:c is 7:9. Find a:b:c in its simplest form.
Answer: 7:35:45 -
5. Statistics Averages and range
Find the mean, median and range of: 46, 12, 94, 44, 35, 49, 57, 67
Answer: Mean = 50.5, Median = 47.5, Range = 82