Keystones — Capstone
Five GCSE retrieval questions · 7 October 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √600
Answer: 10√6 -
2. Algebra Completing the square
Complete the square: x² + x + 2
Answer: (x + 1⁄2)² + 7⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 12cm, b = 28cm, angle = 64°. Give your answer to 2 decimal places
Answer: 151cm² -
4. Ratio Combining two ratios
a:b is 2:3 and b:c is 4:9. Find a:b:c in its simplest form.
Answer: 8:12:27 -
5. Statistics Averages and range
Find the mean, median and range of: 13, 63, 44, 32, 90, 29, 30
Answer: Mean = 43, Median = 32, Range = 77