Keystones — Capstone
Five GCSE retrieval questions · 15 July 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 5√12
Answer: 10√3 -
2. Algebra Completing the square
Complete the square: 3x² + 18x - 12
Answer: 3(x + 3)² - 39 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 24cm, b = 27cm, angle = 53°. Give your answer to 2 decimal places
Answer: 258.76cm² -
4. Ratio Combining two ratios
a:b is 4:5 and b:c is 7:1. Find a:b:c in its simplest form.
Answer: 28:35:5 -
5. Statistics Averages and range
Find the mean, median and range of: 23, 30, 38, 98, 49, 92, 46, 11. Give your answer to 2 decimal places
Answer: Mean = 48.38, Median = 42, Range = 87