Keystones — Capstone
Five GCSE retrieval questions · 31 August 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √176
Answer: 4√11 -
2. Algebra Completing the square
Complete the square: 4x² - 8x - 4
Answer: 4(x - 1)² - 8 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 21cm, b = 26cm, angle = 67°. Give your answer to 2 decimal places
Answer: 251.3cm² -
4. Ratio Combining two ratios
a:b is 7:2 and b:c is 5:1. Find a:b:c in its simplest form.
Answer: 35:10:2 -
5. Statistics Averages and range
Find the mean, median and range of: 68, 37, 67, 25, 18, 76, 82. Give your answer to 2 decimal places
Answer: Mean = 53.29, Median = 67, Range = 64