Keystones — Capstone
Five GCSE retrieval questions · 16 May 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 3√250
Answer: 15√10 -
2. Algebra Completing the square
Complete the square: 2x² + 12x - 11
Answer: 2(x + 3)² - 29 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 30cm, b = 20cm, angle = 43°. Give your answer to 2 decimal places
Answer: 204.6cm² -
4. Ratio Combining two ratios
a:b is 1:3 and b:c is 5:3. Find a:b:c in its simplest form.
Answer: 5:15:9 -
5. Statistics Averages and range
Find the mean, median and range of: 10, 54, 31, 47, 76, 24, 22, 64, 97. Give your answer to 2 decimal places
Answer: Mean = 47.22, Median = 47, Range = 87