Keystones — Capstone
Five GCSE retrieval questions · 21 December 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 5√112
Answer: 20√7 -
2. Algebra Completing the square
Complete the square: 3x² + 12x + 14
Answer: 3(x + 2)² + 2 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 25cm, b = 18cm, angle = 68°. Give your answer to 2 decimal places
Answer: 208.62cm² -
4. Ratio Combining two ratios
a:b is 4:7 and b:c is 3:1. Find a:b:c in its simplest form.
Answer: 12:21:7 -
5. Statistics Averages and range
Find the mean, median and range of: 61, 42, 78, 18, 79, 24, 60, 36, 23. Give your answer to 2 decimal places
Answer: Mean = 46.78, Median = 42, Range = 61