Keystones — Capstone
Five GCSE retrieval questions · 22 September 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √1000
Answer: 10√10 -
2. Algebra Completing the square
Complete the square: 2x² + 20x - 10
Answer: 2(x + 5)² - 60 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 26cm, b = 27cm, angle = 51°. Give your answer to 2 decimal places
Answer: 272.78cm² -
4. Ratio Combining two ratios
a:b is 9:2 and b:c is 7:9. Find a:b:c in its simplest form.
Answer: 63:14:18 -
5. Statistics Averages and range
Find the mean, median and range of: 15, 34, 20, 30, 78, 97, 46. Give your answer to 2 decimal places
Answer: Mean = 45.71, Median = 34, Range = 82