Keystones — Capstone
Five GCSE retrieval questions · 18 January 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √176
Answer: 4√11 -
2. Algebra Completing the square
Complete the square: 4x² + 48x + 13
Answer: 4(x + 6)² - 131 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 15cm, b = 28cm, angle = 46°. Give your answer to 2 decimal places
Answer: 151.06cm² -
4. Ratio Combining two ratios
a:b is 2:5 and b:c is 2:5. Find a:b:c in its simplest form.
Answer: 4:10:25 -
5. Statistics Averages and range
Find the mean, median and range of: 22, 18, 69, 13, 62, 71, 63, 74, 78. Give your answer to 2 decimal places
Answer: Mean = 52.22, Median = 63, Range = 65