Keystones — Capstone
Five GCSE retrieval questions · 2 September 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √242
Answer: 11√2 -
2. Algebra Completing the square
Complete the square: 5x² + 20x - 5
Answer: 5(x + 2)² - 25 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 15cm, b = 16cm, angle = 65°. Give your answer to 2 decimal places
Answer: 108.76cm² -
4. Ratio Combining two ratios
a:b is 9:4 and b:c is 5:8. Find a:b:c in its simplest form.
Answer: 45:20:32 -
5. Statistics Averages and range
Find the mean, median and range of: 69, 23, 99, 25, 63, 13, 37, 83, 44. Give your answer to 2 decimal places
Answer: Mean = 50.67, Median = 44, Range = 86