Keystones — Capstone
Five GCSE retrieval questions · 19 March 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √224
Answer: 4√14 -
2. Algebra Completing the square
Complete the square: 4x² + 48x - 6
Answer: 4(x + 6)² - 150 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 21cm, b = 17cm, angle = 74°. Give your answer to 2 decimal places
Answer: 171.59cm² -
4. Ratio Combining two ratios
a:b is 2:9 and b:c is 2:9. Find a:b:c in its simplest form.
Answer: 4:18:81 -
5. Statistics Averages and range
Find the mean, median and range of: 23, 72, 95, 19, 10, 48, 12, 70. Give your answer to 2 decimal places
Answer: Mean = 43.63, Median = 35.5, Range = 85