Keystones — Capstone
Five GCSE retrieval questions · 22 October 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 4√45
Answer: 12√5 -
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 = 25cm, b = 14cm, angle = 80°. Give your answer to 2 decimal places
Answer: 172.34cm² -
4. Ratio Combining two ratios
a:b is 6:5 and b:c is 7:4. Find a:b:c in its simplest form.
Answer: 42:35:20 -
5. Statistics Averages and range
Find the mean, median and range of: 46, 73, 10, 87, 59, 93, 45, 58. Give your answer to 2 decimal places
Answer: Mean = 58.88, Median = 58.5, Range = 83