Keystones — Capstone
Five GCSE retrieval questions · 6 January 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 2√20
Answer: 4√5 -
2. Algebra Completing the square
Complete the square: 2x² - 8x + 12
Answer: 2(x - 2)² + 4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 22cm, b = 14cm, angle = 78°. Give your answer to 2 decimal places
Answer: 150.63cm² -
4. Ratio Combining two ratios
a:b is 7:3 and b:c is 2:7. Find a:b:c in its simplest form.
Answer: 14:6:21 -
5. Statistics Averages and range
Find the mean, median and range of: 80, 76, 52, 71, 97, 43, 17. Give your answer to 2 decimal places
Answer: Mean = 62.29, Median = 71, Range = 80