Keystones — Capstone
Five GCSE retrieval questions · 29 June 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √48
Answer: 4√3 -
2. Algebra Completing the square
Complete the square: 2x² - 4x - 10
Answer: 2(x - 1)² - 12 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 14cm, b = 30cm, angle = 44°. Give your answer to 2 decimal places
Answer: 145.88cm² -
4. Ratio Combining two ratios
a:b is 2:9 and b:c is 6:1. Find a:b:c in its simplest form.
Answer: 4:18:3 -
5. Statistics Averages and range
Find the mean, median and range of: 80, 100, 39, 62, 40, 94, 65, 56
Answer: Mean = 67, Median = 63.5, Range = 61