Keystones — Capstone
Five GCSE retrieval questions · 10 February 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √150
Answer: 5√6 -
2. Algebra Completing the square
Complete the square: 3x² + 24x + 6
Answer: 3(x + 4)² - 42 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 30cm, b = 27cm, angle = 76°. Give your answer to 2 decimal places
Answer: 392.97cm² -
4. Ratio Combining two ratios
a:b is 5:6 and b:c is 5:8. Find a:b:c in its simplest form.
Answer: 25:30:48 -
5. Statistics Averages and range
Find the mean, median and range of: 96, 11, 60, 24, 86, 87, 28
Answer: Mean = 56, Median = 60, Range = 85