Keystones — Capstone
Five GCSE retrieval questions · 2 July 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √320
Answer: 8√5 -
2. Algebra Completing the square
Complete the square: 4x² + 24x + 3
Answer: 4(x + 3)² - 33 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 22cm, b = 16cm, angle = 78°. Give your answer to 2 decimal places
Answer: 172.15cm² -
4. Ratio Combining two ratios
a:b is 2:3 and b:c is 4:9. Find a:b:c in its simplest form.
Answer: 8:12:27 -
5. Statistics Averages and range
Find the mean, median and range of: 20, 43, 56, 62, 94, 57, 77, 21, 69. Give your answer to 2 decimal places
Answer: Mean = 55.44, Median = 57, Range = 74