Keystones — Capstone
Five GCSE retrieval questions · 31 January 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 2√40
Answer: 4√10 -
2. Algebra Completing the square
Complete the square: 4x² + 48x + 6
Answer: 4(x + 6)² - 138 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 18cm, b = 13cm, angle = 65°. Give your answer to 2 decimal places
Answer: 106.04cm² -
4. Ratio Combining two ratios
a:b is 7:8 and b:c is 5:6. Find a:b:c in its simplest form.
Answer: 35:40:48 -
5. Statistics Averages and range
Find the mean, median and range of: 20, 87, 54, 94, 23, 33, 97, 50, 52. Give your answer to 2 decimal places
Answer: Mean = 56.67, Median = 52, Range = 77