Keystones — Capstone
Five GCSE retrieval questions · 28 February 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √32
Answer: 4√2 -
2. Algebra Completing the square
Complete the square: 4x² - 8x - 13
Answer: 4(x - 1)² - 17 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 27cm, b = 24cm, angle = 70°. Give your answer to 2 decimal places
Answer: 304.46cm² -
4. Ratio Combining two ratios
a:b is 7:3 and b:c is 5:8. Find a:b:c in its simplest form.
Answer: 35:15:24 -
5. Statistics Averages and range
Find the mean, median and range of: 61, 18, 45, 40, 50, 64, 34, 87, 90. Give your answer to 2 decimal places
Answer: Mean = 54.33, Median = 50, Range = 72