Keystones — Capstone
Five GCSE retrieval questions · 26 November 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 + 10x - 1
Answer: 5(x + 1)² - 6 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 30cm, b = 22cm, angle = 68°. Give your answer to 2 decimal places
Answer: 305.97cm² -
4. Ratio Combining two ratios
a:b is 1:7 and b:c is 9:5. Find a:b:c in its simplest form.
Answer: 9:63:35 -
5. Statistics Averages and range
Find the mean, median and range of: 14, 49, 98, 43, 38, 55, 22, 71
Answer: Mean = 48.75, Median = 46, Range = 84