Keystones — Capstone
Five GCSE retrieval questions · 27 December 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √350
Answer: 5√14 -
2. Algebra Completing the square
Complete the square: 3x² - 12x - 10
Answer: 3(x - 2)² - 22 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 21cm, b = 30cm, angle = 51°. Give your answer to 2 decimal places
Answer: 244.8cm² -
4. Ratio Combining two ratios
a:b is 3:5 and b:c is 2:3. Find a:b:c in its simplest form.
Answer: 6:10:15 -
5. Statistics Averages and range
Find the mean, median and range of: 92, 71, 42, 27, 26, 21, 69, 64
Answer: Mean = 51.5, Median = 53, Range = 71