Keystones — Capstone
Five GCSE retrieval questions · 29 March 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √245
Answer: 7√5 -
2. Algebra Completing the square
Complete the square: 2x² + 4x - 8
Answer: 2(x + 1)² - 10 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 21cm, b = 17cm, angle = 76°. Give your answer to 2 decimal places
Answer: 173.2cm² -
4. Ratio Combining two ratios
a:b is 8:7 and b:c is 5:4. Find a:b:c in its simplest form.
Answer: 40:35:28 -
5. Statistics Averages and range
Find the mean, median and range of: 29, 82, 10, 54, 27, 49, 48, 47, 20. Give your answer to 2 decimal places
Answer: Mean = 40.67, Median = 47, Range = 72