Keystones — Capstone
Five GCSE retrieval questions · 9 June 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √112
Answer: 4√7 -
2. Algebra Completing the square
Complete the square: 3x² + 18x - 13
Answer: 3(x + 3)² - 40 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 14cm, b = 19cm, angle = 50°. Give your answer to 2 decimal places
Answer: 101.88cm² -
4. Ratio Combining two ratios
a:b is 8:9 and b:c is 7:4. Find a:b:c in its simplest form.
Answer: 56:63:36 -
5. Statistics Averages and range
Find the mean, median and range of: 71, 70, 77, 25, 68, 64, 53, 17, 79. Give your answer to 2 decimal places
Answer: Mean = 58.22, Median = 68, Range = 62