Keystones — Capstone
Five GCSE retrieval questions · 5 January 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √242
Answer: 11√2 -
2. Algebra Completing the square
Complete the square: 4x² + 40x - 1
Answer: 4(x + 5)² - 101 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 27cm, b = 27cm, angle = 69°. Give your answer to 2 decimal places
Answer: 340.29cm² -
4. Ratio Combining two ratios
a:b is 6:5 and b:c is 9:2. Find a:b:c in its simplest form.
Answer: 54:45:10 -
5. Statistics Averages and range
Find the mean, median and range of: 28, 52, 99, 100, 62, 99, 71, 66, 53
Answer: Mean = 70, Median = 66, Range = 72