Keystones — Capstone
Five GCSE retrieval questions · 21 November 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √98
Answer: 7√2 -
2. Algebra Completing the square
Complete the square: 4x² - 48x + 12
Answer: 4(x - 6)² - 132 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 29cm, b = 16cm, angle = 80°. Give your answer to 2 decimal places
Answer: 228.48cm² -
4. Ratio Combining two ratios
a:b is 9:5 and b:c is 4:3. Find a:b:c in its simplest form.
Answer: 36:20:15 -
5. Statistics Averages and range
Find the mean, median and range of: 17, 88, 41, 49, 47, 31, 39, 86, 99. Give your answer to 2 decimal places
Answer: Mean = 55.22, Median = 47, Range = 82