Keystones — Capstone
Five GCSE retrieval questions · 13 May 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √810
Answer: 9√10 -
2. Algebra Completing the square
Complete the square: 2x² + 4x - 11
Answer: 2(x + 1)² - 13 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 19cm, b = 16cm, angle = 41°. Give your answer to 2 decimal places
Answer: 99.72cm² -
4. Ratio Combining two ratios
a:b is 3:4 and b:c is 7:2. Find a:b:c in its simplest form.
Answer: 21:28:8 -
5. Statistics Averages and range
Find the mean, median and range of: 60, 39, 82, 31, 90, 77, 37, 38
Answer: Mean = 56.75, Median = 49.5, Range = 59