Keystones — Capstone
Five GCSE retrieval questions · 23 October 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √425
Answer: 5√17 -
2. Algebra Completing the square
Complete the square: 5x² - 10x + 6
Answer: 5(x - 1)² + 1 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 20cm, b = 18cm, angle = 70°. Give your answer to 2 decimal places
Answer: 169.14cm² -
4. Ratio Combining two ratios
a:b is 9:5 and b:c is 7:3. Find a:b:c in its simplest form.
Answer: 63:35:15 -
5. Statistics Averages and range
Find the mean, median and range of: 93, 66, 36, 65, 70, 71, 18. Give your answer to 2 decimal places
Answer: Mean = 59.86, Median = 66, Range = 75