Keystones — Capstone
Five GCSE retrieval questions · 2 April 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 3√20
Answer: 6√5 -
2. Algebra Completing the square
Complete the square: 5x² - 30x + 13
Answer: 5(x - 3)² - 32 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 27cm, b = 29cm, angle = 52°. Give your answer to 2 decimal places
Answer: 308.51cm² -
4. Ratio Combining two ratios
a:b is 5:7 and b:c is 2:3. Find a:b:c in its simplest form.
Answer: 10:14:21 -
5. Statistics Averages and range
Find the mean, median and range of: 27, 93, 70, 15, 94, 12, 28. Give your answer to 2 decimal places
Answer: Mean = 48.43, Median = 28, Range = 82