Keystones — Capstone
Five GCSE retrieval questions · 15 December 2014 · 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 - 10x + 12
Answer: 5(x - 1)² + 7 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 29cm, b = 27cm, angle = 59°. Give your answer to 2 decimal places
Answer: 335.58cm² -
4. Ratio Combining two ratios
a:b is 9:8 and b:c is 5:7. Find a:b:c in its simplest form.
Answer: 45:40:56 -
5. Statistics Averages and range
Find the mean, median and range of: 75, 99, 99, 47, 91, 59, 82, 15, 84. Give your answer to 2 decimal places
Answer: Mean = 72.33, Median = 82, Range = 84