Keystones — Capstone
Five GCSE retrieval questions · 4 September 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √272
Answer: 4√17 -
2. Algebra Completing the square
Complete the square: 3x² + 12x + 10
Answer: 3(x + 2)² - 2 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 23cm, b = 21cm, angle = 40°. Give your answer to 2 decimal places
Answer: 155.23cm² -
4. Ratio Combining two ratios
a:b is 9:7 and b:c is 2:5. Find a:b:c in its simplest form.
Answer: 18:14:35 -
5. Statistics Averages and range
Find the mean, median and range of: 17, 68, 35, 65, 44, 62, 68. Give your answer to 2 decimal places
Answer: Mean = 51.29, Median = 62, Range = 51