Keystones — Capstone
Five GCSE retrieval questions · 24 February 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √792
Answer: 6√22 -
2. Algebra Completing the square
Complete the square: x² + 3x - 7
Answer: (x + 3⁄2)² - 37⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 27cm, b = 30cm, angle = 73°. Give your answer to 2 decimal places
Answer: 387.3cm² -
4. Ratio Combining two ratios
a:b is 3:5 and b:c is 7:3. Find a:b:c in its simplest form.
Answer: 21:35:15 -
5. Statistics Averages and range
Find the mean, median and range of: 34, 69, 29, 33, 75, 85, 20, 55
Answer: Mean = 50, Median = 44.5, Range = 65