Keystones — Capstone
Five GCSE retrieval questions · 29 September 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 2√275
Answer: 10√11 -
2. Algebra Completing the square
Complete the square: 2x² - 4x + 13
Answer: 2(x - 1)² + 11 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 21cm, b = 26cm, angle = 77°. Give your answer to 2 decimal places
Answer: 266cm² -
4. Ratio Combining two ratios
a:b is 4:7 and b:c is 2:7. Find a:b:c in its simplest form.
Answer: 8:14:49 -
5. Statistics Averages and range
Find the mean, median and range of: 58, 32, 99, 65, 50, 100, 47, 85, 56. Give your answer to 2 decimal places
Answer: Mean = 65.78, Median = 58, Range = 68