Keystones — Capstone
Five GCSE retrieval questions · 20 February 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 2√40
Answer: 4√10 -
2. Algebra Completing the square
Complete the square: x² + 9x + 8
Answer: (x + 9⁄2)² - 49⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 23cm, b = 15cm, angle = 56°. Give your answer to 2 decimal places
Answer: 143.01cm² -
4. Ratio Combining two ratios
a:b is 1:7 and b:c is 4:7. Find a:b:c in its simplest form.
Answer: 4:28:49 -
5. Statistics Averages and range
Find the mean, median and range of: 75, 92, 100, 37, 87, 26, 59
Answer: Mean = 68, Median = 75, Range = 74