Keystones — Capstone
Five GCSE retrieval questions · 15 December 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √350
Answer: 5√14 -
2. Algebra Completing the square
Complete the square: 2x² + 24x + 10
Answer: 2(x + 6)² - 62 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 14cm, b = 19cm, angle = 52°. Give your answer to 2 decimal places
Answer: 104.81cm² -
4. Ratio Combining two ratios
a:b is 1:5 and b:c is 3:5. Find a:b:c in its simplest form.
Answer: 3:15:25 -
5. Statistics Averages and range
Find the mean, median and range of: 22, 72, 76, 71, 86, 15, 18, 27. Give your answer to 2 decimal places
Answer: Mean = 48.38, Median = 49, Range = 71