Keystones — Capstone
Five GCSE retrieval questions · 29 May 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √792
Answer: 6√22 -
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 = 20cm, b = 13cm, angle = 48°. Give your answer to 2 decimal places
Answer: 96.61cm² -
4. Ratio Combining two ratios
a:b is 1:5 and b:c is 7:2. Find a:b:c in its simplest form.
Answer: 7:35:10 -
5. Statistics Averages and range
Find the mean, median and range of: 43, 48, 68, 69, 51, 18, 40. Give your answer to 2 decimal places
Answer: Mean = 48.14, Median = 48, Range = 51