Keystones — Capstone
Five GCSE retrieval questions · 7 February 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 4√160
Answer: 16√10 -
2. Algebra Completing the square
Complete the square: 4x² - 48x - 5
Answer: 4(x - 6)² - 149 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 23cm, b = 28cm, angle = 46°. Give your answer to 2 decimal places
Answer: 231.63cm² -
4. Ratio Combining two ratios
a:b is 5:4 and b:c is 3:2. Find a:b:c in its simplest form.
Answer: 15:12:8 -
5. Statistics Averages and range
Find the mean, median and range of: 55, 28, 51, 46, 40, 23, 29. Give your answer to 2 decimal places
Answer: Mean = 38.86, Median = 40, Range = 32