Keystones — Capstone
Five GCSE retrieval questions · 22 January 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √125
Answer: 5√5 -
2. Algebra Completing the square
Complete the square: 3x² + 18x - 4
Answer: 3(x + 3)² - 31 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 22cm, b = 30cm, angle = 41°. Give your answer to 2 decimal places
Answer: 216.5cm² -
4. Ratio Combining two ratios
a:b is 2:7 and b:c is 8:9. Find a:b:c in its simplest form.
Answer: 16:56:63 -
5. Statistics Averages and range
Find the mean, median and range of: 47, 99, 16, 30, 62, 72, 30, 19. Give your answer to 2 decimal places
Answer: Mean = 46.88, Median = 38.5, Range = 83