Keystones — Capstone
Five GCSE retrieval questions · 29 January 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √272
Answer: 4√17 -
2. Algebra Completing the square
Complete the square: 5x² + 60x - 14
Answer: 5(x + 6)² - 194 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 15cm, b = 27cm, angle = 79°. Give your answer to 2 decimal places
Answer: 198.78cm² -
4. Ratio Combining two ratios
a:b is 4:3 and b:c is 7:6. Find a:b:c in its simplest form.
Answer: 28:21:18 -
5. Statistics Averages and range
Find the mean, median and range of: 82, 23, 57, 47, 18, 82, 34, 66. Give your answer to 2 decimal places
Answer: Mean = 51.13, Median = 52, Range = 64