Keystones — Capstone
Five GCSE retrieval questions · 13 March 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √612
Answer: 6√17 -
2. Algebra Completing the square
Complete the square: x² + 7x - 10
Answer: (x + 7⁄2)² - 89⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 21cm, b = 16cm, angle = 47°. Give your answer to 2 decimal places
Answer: 122.87cm² -
4. Ratio Combining two ratios
a:b is 2:9 and b:c is 2:7. Find a:b:c in its simplest form.
Answer: 4:18:63 -
5. Statistics Averages and range
Find the mean, median and range of: 19, 100, 63, 84, 70, 43, 61, 50, 44. Give your answer to 2 decimal places
Answer: Mean = 59.33, Median = 61, Range = 81