Keystones — Capstone
Five GCSE retrieval questions · 16 September 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 2√150
Answer: 10√6 -
2. Algebra Completing the square
Complete the square: 2x² - 8x - 1
Answer: 2(x - 2)² - 9 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 27cm, b = 19cm, angle = 67°. Give your answer to 2 decimal places
Answer: 236.11cm² -
4. Ratio Combining two ratios
a:b is 5:3 and b:c is 5:3. Find a:b:c in its simplest form.
Answer: 25:15:9 -
5. Statistics Averages and range
Find the mean, median and range of: 59, 25, 60, 29, 41, 39, 65, 72, 68. Give your answer to 2 decimal places
Answer: Mean = 50.89, Median = 59, Range = 47