Keystones — Capstone
Five GCSE retrieval questions · 12 June 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 3√160
Answer: 12√10 -
2. Algebra Completing the square
Complete the square: 3x² - 12x - 12
Answer: 3(x - 2)² - 24 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 25cm, b = 13cm, angle = 79°. Give your answer to 2 decimal places
Answer: 159.51cm² -
4. Ratio Combining two ratios
a:b is 1:6 and b:c is 7:5. Find a:b:c in its simplest form.
Answer: 7:42:30 -
5. Statistics Averages and range
Find the mean, median and range of: 33, 38, 55, 58, 49, 89, 100, 38, 94. Give your answer to 2 decimal places
Answer: Mean = 61.56, Median = 55, Range = 67