Keystones — Capstone
Five GCSE retrieval questions · 13 June 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √612
Answer: 6√17 -
2. Algebra Completing the square
Complete the square: 3x² + 36x - 2
Answer: 3(x + 6)² - 110 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 30cm, b = 24cm, angle = 55°. Give your answer to 2 decimal places
Answer: 294.89cm² -
4. Ratio Combining two ratios
a:b is 8:9 and b:c is 8:3. Find a:b:c in its simplest form.
Answer: 64:72:27 -
5. Statistics Averages and range
Find the mean, median and range of: 63, 25, 56, 22, 71, 48, 69. Give your answer to 2 decimal places
Answer: Mean = 50.57, Median = 56, Range = 49