Keystones — Capstone
Five GCSE retrieval questions · 22 December 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √550
Answer: 5√22 -
2. Algebra Completing the square
Complete the square: x² + 3x + 2
Answer: (x + 3⁄2)² - 1⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 20cm, b = 19cm, angle = 68°. Give your answer to 2 decimal places
Answer: 176.16cm² -
4. Ratio Combining two ratios
a:b is 1:2 and b:c is 9:4. Find a:b:c in its simplest form.
Answer: 9:18:8 -
5. Statistics Averages and range
Find the mean, median and range of: 36, 89, 92, 37, 25, 16, 13
Answer: Mean = 44, Median = 36, Range = 79