Keystones — Capstone
Five GCSE retrieval questions · 11 October 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 5√28
Answer: 10√7 -
2. Algebra Completing the square
Complete the square: 5x² + 10x + 9
Answer: 5(x + 1)² + 4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 24cm, b = 26cm, angle = 65°. Give your answer to 2 decimal places
Answer: 282.77cm² -
4. Ratio Combining two ratios
a:b is 5:2 and b:c is 7:2. Find a:b:c in its simplest form.
Answer: 35:14:4 -
5. Statistics Averages and range
Find the mean, median and range of: 86, 13, 37, 45, 48, 89, 23. Give your answer to 2 decimal places
Answer: Mean = 48.71, Median = 45, Range = 76