Keystones — Capstone
Five GCSE retrieval questions · 18 October 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √208
Answer: 4√13 -
2. Algebra Completing the square
Complete the square: 3x² - 36x - 7
Answer: 3(x - 6)² - 115 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 20cm, b = 24cm, angle = 52°. Give your answer to 2 decimal places
Answer: 189.12cm² -
4. Ratio Combining two ratios
a:b is 7:6 and b:c is 5:8. Find a:b:c in its simplest form.
Answer: 35:30:48 -
5. Statistics Averages and range
Find the mean, median and range of: 38, 63, 32, 72, 56, 28, 66. Give your answer to 2 decimal places
Answer: Mean = 50.71, Median = 56, Range = 44