Keystones — Capstone
Five GCSE retrieval questions · 19 May 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 5√8
Answer: 10√2 -
2. Algebra Completing the square
Complete the square: x² + 7x - 2
Answer: (x + 7⁄2)² - 57⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 17cm, b = 24cm, angle = 47°. Give your answer to 2 decimal places
Answer: 149.2cm² -
4. Ratio Combining two ratios
a:b is 1:5 and b:c is 6:7. Find a:b:c in its simplest form.
Answer: 6:30:35 -
5. Statistics Averages and range
Find the mean, median and range of: 80, 96, 17, 11, 100, 24, 71, 37, 51. Give your answer to 2 decimal places
Answer: Mean = 54.11, Median = 51, Range = 89