Keystones — Capstone
Five GCSE retrieval questions · 12 November 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √352
Answer: 4√22 -
2. Algebra Completing the square
Complete the square: 2x² + 24x + 14
Answer: 2(x + 6)² - 58 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 19cm, b = 18cm, angle = 50°. Give your answer to 2 decimal places
Answer: 130.99cm² -
4. Ratio Combining two ratios
a:b is 8:3 and b:c is 5:4. Find a:b:c in its simplest form.
Answer: 40:15:12 -
5. Statistics Averages and range
Find the mean, median and range of: 50, 18, 30, 42, 31, 68, 80, 76. Give your answer to 2 decimal places
Answer: Mean = 49.38, Median = 46, Range = 62