Keystones — Capstone
Five GCSE retrieval questions · 18 November 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 2√12
Answer: 4√3 -
2. Algebra Completing the square
Complete the square: 3x² + 12x + 10
Answer: 3(x + 2)² - 2 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 25cm, b = 21cm, angle = 70°. Give your answer to 2 decimal places
Answer: 246.67cm² -
4. Ratio Combining two ratios
a:b is 5:7 and b:c is 4:1. Find a:b:c in its simplest form.
Answer: 20:28:7 -
5. Statistics Averages and range
Find the mean, median and range of: 81, 74, 95, 60, 79, 93, 33, 95, 69. Give your answer to 2 decimal places
Answer: Mean = 75.44, Median = 79, Range = 62