Keystones — Capstone
Five GCSE retrieval questions · 27 July 2015 · 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 + 30x
Answer: 5(x + 3)² - 45 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 29cm, b = 27cm, angle = 46°. Give your answer to 2 decimal places
Answer: 281.62cm² -
4. Ratio Combining two ratios
a:b is 2:7 and b:c is 3:7. Find a:b:c in its simplest form.
Answer: 6:21:49 -
5. Statistics Averages and range
Find the mean, median and range of: 50, 31, 95, 56, 22, 95, 32. Give your answer to 2 decimal places
Answer: Mean = 54.43, Median = 50, Range = 73