Keystones — Capstone
Five GCSE retrieval questions · 26 May 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: 3x² + 36x + 13
Answer: 3(x + 6)² - 95 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 12cm, b = 28cm, angle = 78°. Give your answer to 2 decimal places
Answer: 164.33cm² -
4. Ratio Combining two ratios
a:b is 1:7 and b:c is 5:8. Find a:b:c in its simplest form.
Answer: 5:35:56 -
5. Statistics Averages and range
Find the mean, median and range of: 40, 82, 13, 24, 82, 80, 81. Give your answer to 2 decimal places
Answer: Mean = 57.43, Median = 80, Range = 69