Keystones — Capstone
Five GCSE retrieval questions · 7 September 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √98
Answer: 7√2 -
2. Algebra Completing the square
Complete the square: x² + 7x + 6
Answer: (x + 7⁄2)² - 25⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 16cm, b = 27cm, angle = 62°. Give your answer to 2 decimal places
Answer: 190.72cm² -
4. Ratio Combining two ratios
a:b is 5:4 and b:c is 7:4. Find a:b:c in its simplest form.
Answer: 35:28:16 -
5. Statistics Averages and range
Find the mean, median and range of: 11, 36, 55, 12, 91, 42, 47
Answer: Mean = 42, Median = 42, Range = 80