Keystones — Capstone
Five GCSE retrieval questions · 2 May 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √612
Answer: 6√17 -
2. Algebra Completing the square
Complete the square: x² - 9x + 11
Answer: (x - 9⁄2)² - 37⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 19cm, b = 17cm, angle = 79°. Give your answer to 2 decimal places
Answer: 158.53cm² -
4. Ratio Combining two ratios
a:b is 3:4 and b:c is 3:4. Find a:b:c in its simplest form.
Answer: 9:12:16 -
5. Statistics Averages and range
Find the mean, median and range of: 22, 91, 38, 72, 92, 34, 12, 91
Answer: Mean = 56.5, Median = 55, Range = 80