Keystones — Capstone
Five GCSE retrieval questions · 6 June 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √180
Answer: 6√5 -
2. Algebra Completing the square
Complete the square: 3x² + 6x + 8
Answer: 3(x + 1)² + 5 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 26cm, b = 28cm, angle = 51°. Give your answer to 2 decimal places
Answer: 282.88cm² -
4. Ratio Combining two ratios
a:b is 1:2 and b:c is 3:2. Find a:b:c in its simplest form.
Answer: 3:6:4 -
5. Statistics Averages and range
Find the mean, median and range of: 79, 61, 79, 21, 14, 10, 81. Give your answer to 2 decimal places
Answer: Mean = 49.29, Median = 61, Range = 71