Keystones — Capstone
Five GCSE retrieval questions · 14 March 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √304
Answer: 4√19 -
2. Algebra Completing the square
Complete the square: x² - 3x + 7
Answer: (x - 3⁄2)² + 19⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 16cm, b = 23cm, angle = 62°. Give your answer to 2 decimal places
Answer: 162.46cm² -
4. Ratio Combining two ratios
a:b is 8:7 and b:c is 4:5. Find a:b:c in its simplest form.
Answer: 32:28:35 -
5. Statistics Averages and range
Find the mean, median and range of: 96, 91, 44, 38, 39, 88, 35, 38. Give your answer to 2 decimal places
Answer: Mean = 58.63, Median = 41.5, Range = 61