Keystones — Capstone
Five GCSE retrieval questions · 9 March 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √245
Answer: 7√5 -
2. Algebra Completing the square
Complete the square: x² + x - 10
Answer: (x + 1⁄2)² - 41⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 16cm, b = 15cm, angle = 55°. Give your answer to 2 decimal places
Answer: 98.3cm² -
4. Ratio Combining two ratios
a:b is 7:6 and b:c is 8:9. Find a:b:c in its simplest form.
Answer: 28:24:27 -
5. Statistics Averages and range
Find the mean, median and range of: 86, 99, 27, 30, 66, 44, 51. Give your answer to 2 decimal places
Answer: Mean = 57.57, Median = 51, Range = 72