Keystones — Capstone
Five GCSE retrieval questions · 26 June 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 4√20
Answer: 8√5 -
2. Algebra Completing the square
Complete the square: x² + 3x - 6
Answer: (x + 3⁄2)² - 33⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 28cm, b = 30cm, angle = 66°. Give your answer to 2 decimal places
Answer: 383.69cm² -
4. Ratio Combining two ratios
a:b is 7:2 and b:c is 7:4. Find a:b:c in its simplest form.
Answer: 49:14:8 -
5. Statistics Averages and range
Find the mean, median and range of: 60, 36, 25, 92, 46, 86, 46, 12. Give your answer to 2 decimal places
Answer: Mean = 50.38, Median = 46, Range = 80