Keystones — Capstone
Five GCSE retrieval questions · 23 August 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √700
Answer: 10√7 -
2. Algebra Completing the square
Complete the square: 2x² + 8x - 6
Answer: 2(x + 2)² - 14 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 22cm, b = 16cm, angle = 47°. Give your answer to 2 decimal places
Answer: 128.72cm² -
4. Ratio Combining two ratios
a:b is 1:9 and b:c is 4:7. Find a:b:c in its simplest form.
Answer: 4:36:63 -
5. Statistics Averages and range
Find the mean, median and range of: 33, 28, 84, 81, 70, 22, 46
Answer: Mean = 52, Median = 46, Range = 62