Keystones — Capstone
Five GCSE retrieval questions · 3 September 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 3√28
Answer: 6√7 -
2. Algebra Completing the square
Complete the square: 3x² - 6x + 1
Answer: 3(x - 1)² - 2 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 21cm, b = 27cm, angle = 55°. Give your answer to 2 decimal places
Answer: 232.23cm² -
4. Ratio Combining two ratios
a:b is 8:7 and b:c is 2:5. Find a:b:c in its simplest form.
Answer: 16:14:35 -
5. Statistics Averages and range
Find the mean, median and range of: 22, 99, 35, 24, 70, 81, 35, 38
Answer: Mean = 50.5, Median = 36.5, Range = 77