Keystones — Capstone
Five GCSE retrieval questions · 25 January 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: x² + 3x + 6
Answer: (x + 3⁄2)² + 15⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 27cm, b = 14cm, angle = 77°. Give your answer to 2 decimal places
Answer: 184.16cm² -
4. Ratio Combining two ratios
a:b is 8:9 and b:c is 4:3. Find a:b:c in its simplest form.
Answer: 32:36:27 -
5. Statistics Averages and range
Find the mean, median and range of: 83, 71, 89, 57, 71, 25, 30, 91. Give your answer to 2 decimal places
Answer: Mean = 64.63, Median = 71, Range = 66