Keystones — Capstone
Five GCSE retrieval questions · 17 February 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √208
Answer: 4√13 -
2. Algebra Completing the square
Complete the square: 3x² + 6x - 10
Answer: 3(x + 1)² - 13 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 17cm, b = 26cm, angle = 45°. Give your answer to 2 decimal places
Answer: 156.27cm² -
4. Ratio Combining two ratios
a:b is 7:6 and b:c is 4:1. Find a:b:c in its simplest form.
Answer: 14:12:3 -
5. Statistics Averages and range
Find the mean, median and range of: 74, 13, 27, 98, 67, 64, 41, 90, 39
Answer: Mean = 57, Median = 64, Range = 85