Keystones — Capstone
Five GCSE retrieval questions · 22 February 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √539
Answer: 7√11 -
2. Algebra Completing the square
Complete the square: 5x² - 60x + 10
Answer: 5(x - 6)² - 170 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 21cm, b = 28cm, angle = 45°. Give your answer to 2 decimal places
Answer: 207.89cm² -
4. Ratio Combining two ratios
a:b is 2:9 and b:c is 2:9. Find a:b:c in its simplest form.
Answer: 4:18:81 -
5. Statistics Averages and range
Find the mean, median and range of: 11, 55, 70, 77, 75, 76, 18, 57, 52. Give your answer to 2 decimal places
Answer: Mean = 54.56, Median = 57, Range = 66