Keystones — Capstone
Five GCSE retrieval questions · 15 April 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 5√20
Answer: 10√5 -
2. Algebra Completing the square
Complete the square: 2x² + 8x + 1
Answer: 2(x + 2)² - 7 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 19cm, b = 20cm, angle = 71°. Give your answer to 2 decimal places
Answer: 179.65cm² -
4. Ratio Combining two ratios
a:b is 2:5 and b:c is 2:9. Find a:b:c in its simplest form.
Answer: 4:10:45 -
5. Statistics Averages and range
Find the mean, median and range of: 27, 86, 85, 52, 94, 62, 11, 60, 63
Answer: Mean = 60, Median = 62, Range = 83