Keystones — Capstone
Five GCSE retrieval questions · 12 July 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 4√176
Answer: 16√11 -
2. Algebra Completing the square
Complete the square: 3x² + 24x
Answer: 3(x + 4)² - 48 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 19cm, b = 24cm, angle = 67°. Give your answer to 2 decimal places
Answer: 209.88cm² -
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: 49, 90, 60, 89, 51, 43, 84. Give your answer to 2 decimal places
Answer: Mean = 66.57, Median = 60, Range = 47