Keystones — Capstone
Five GCSE retrieval questions · 26 December 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √272
Answer: 4√17 -
2. Algebra Completing the square
Complete the square: 2x² - 4x + 5
Answer: 2(x - 1)² + 3 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 22cm, b = 20cm, angle = 55°. Give your answer to 2 decimal places
Answer: 180.21cm² -
4. Ratio Combining two ratios
a:b is 1:4 and b:c is 6:1. Find a:b:c in its simplest form.
Answer: 3:12:2 -
5. Statistics Averages and range
Find the mean, median and range of: 43, 54, 76, 99, 37, 93, 77, 49, 41. Give your answer to 2 decimal places
Answer: Mean = 63.22, Median = 54, Range = 62