Keystones — Capstone
Five GCSE retrieval questions · 8 September 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √550
Answer: 5√22 -
2. Algebra Completing the square
Complete the square: 5x² + 60x
Answer: 5(x + 6)² - 180 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 20cm, b = 19cm, angle = 77°. Give your answer to 2 decimal places
Answer: 185.13cm² -
4. Ratio Combining two ratios
a:b is 3:2 and b:c is 7:8. Find a:b:c in its simplest form.
Answer: 21:14:16 -
5. Statistics Averages and range
Find the mean, median and range of: 99, 58, 64, 66, 97, 84, 88, 65. Give your answer to 2 decimal places
Answer: Mean = 77.63, Median = 75, Range = 41