Keystones — Capstone
Five GCSE retrieval questions · 23 November 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 3√8
Answer: 6√2 -
2. Algebra Completing the square
Complete the square: x² + 3x + 4
Answer: (x + 3⁄2)² + 7⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 13cm, b = 15cm, angle = 43°. Give your answer to 2 decimal places
Answer: 66.49cm² -
4. Ratio Combining two ratios
a:b is 1:8 and b:c is 5:2. Find a:b:c in its simplest form.
Answer: 5:40:16 -
5. Statistics Averages and range
Find the mean, median and range of: 69, 36, 11, 67, 23, 43, 78, 10, 31. Give your answer to 2 decimal places
Answer: Mean = 40.89, Median = 36, Range = 68