Keystones — Capstone
Five GCSE retrieval questions · 11 August 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √288
Answer: 12√2 -
2. Algebra Completing the square
Complete the square: x² + 7x + 2
Answer: (x + 7⁄2)² - 41⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 19cm, b = 17cm, angle = 42°. Give your answer to 2 decimal places
Answer: 108.06cm² -
4. Ratio Combining two ratios
a:b is 6:5 and b:c is 4:9. Find a:b:c in its simplest form.
Answer: 24:20:45 -
5. Statistics Averages and range
Find the mean, median and range of: 84, 63, 56, 96, 23, 63, 74, 92. Give your answer to 2 decimal places
Answer: Mean = 68.88, Median = 68.5, Range = 73