Keystones — Capstone
Five GCSE retrieval questions · 19 July 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √325
Answer: 5√13 -
2. Algebra Completing the square
Complete the square: 5x² + 10x - 12
Answer: 5(x + 1)² - 17 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 18cm, b = 27cm, angle = 49°. Give your answer to 2 decimal places
Answer: 183.39cm² -
4. Ratio Combining two ratios
a:b is 1:4 and b:c is 5:3. Find a:b:c in its simplest form.
Answer: 5:20:12 -
5. Statistics Averages and range
Find the mean, median and range of: 58, 67, 50, 19, 77, 95, 84, 16, 28. Give your answer to 2 decimal places
Answer: Mean = 54.89, Median = 58, Range = 79