Keystones — Capstone
Five GCSE retrieval questions · 16 February 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 5√45
Answer: 15√5 -
2. Algebra Completing the square
Complete the square: 4x² + 24x - 10
Answer: 4(x + 3)² - 46 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 26cm, b = 27cm, angle = 42°. Give your answer to 2 decimal places
Answer: 234.86cm² -
4. Ratio Combining two ratios
a:b is 3:2 and b:c is 5:3. Find a:b:c in its simplest form.
Answer: 15:10:6 -
5. Statistics Averages and range
Find the mean, median and range of: 38, 94, 79, 98, 55, 91, 64, 12. Give your answer to 2 decimal places
Answer: Mean = 66.38, Median = 71.5, Range = 86