Keystones — Capstone
Five GCSE retrieval questions · 21 November 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √960
Answer: 8√15 -
2. Algebra Completing the square
Complete the square: x² + x + 5
Answer: (x + 1⁄2)² + 19⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 15cm, b = 15cm, angle = 52°. Give your answer to 2 decimal places
Answer: 88.65cm² -
4. Ratio Combining two ratios
a:b is 7:3 and b:c is 8:9. Find a:b:c in its simplest form.
Answer: 56:24:27 -
5. Statistics Averages and range
Find the mean, median and range of: 25, 20, 90, 64, 30, 18, 25, 79, 69. Give your answer to 2 decimal places
Answer: Mean = 46.67, Median = 30, Range = 72