Keystones — Capstone
Five GCSE retrieval questions · 1 December 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √224
Answer: 4√14 -
2. Algebra Completing the square
Complete the square: x² + 5x - 12
Answer: (x + 5⁄2)² - 73⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 29cm, b = 12cm, angle = 47°. Give your answer to 2 decimal places
Answer: 127.26cm² -
4. Ratio Combining two ratios
a:b is 6:7 and b:c is 2:7. Find a:b:c in its simplest form.
Answer: 12:14:49 -
5. Statistics Averages and range
Find the mean, median and range of: 81, 19, 61, 90, 57, 16, 64, 95, 37. Give your answer to 2 decimal places
Answer: Mean = 57.78, Median = 61, Range = 79