Keystones — Capstone
Five GCSE retrieval questions · 9 August 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 2√175
Answer: 10√7 -
2. Algebra Completing the square
Complete the square: 4x² - 24x + 6
Answer: 4(x - 3)² - 30 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 13cm, b = 19cm, angle = 49°. Give your answer to 2 decimal places
Answer: 93.21cm² -
4. Ratio Combining two ratios
a:b is 9:7 and b:c is 8:5. Find a:b:c in its simplest form.
Answer: 72:56:35 -
5. Statistics Averages and range
Find the mean, median and range of: 14, 38, 84, 90, 55, 89, 68, 94, 26
Answer: Mean = 62, Median = 68, Range = 80