Keystones — Capstone
Five GCSE retrieval questions · 2 January 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √176
Answer: 4√11 -
2. Algebra Completing the square
Complete the square: 3x² + 24x - 9
Answer: 3(x + 4)² - 57 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 27cm, b = 21cm, angle = 77°. Give your answer to 2 decimal places
Answer: 276.23cm² -
4. Ratio Combining two ratios
a:b is 1:7 and b:c is 3:7. Find a:b:c in its simplest form.
Answer: 3:21:49 -
5. Statistics Averages and range
Find the mean, median and range of: 60, 72, 67, 84, 60, 28, 89. Give your answer to 2 decimal places
Answer: Mean = 65.71, Median = 67, Range = 61