Keystones — Capstone
Five GCSE retrieval questions · 11 September 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 2√96
Answer: 8√6 -
2. Algebra Completing the square
Complete the square: 5x² + 10x
Answer: 5(x + 1)² - 5 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 28cm, b = 26cm, angle = 64°. Give your answer to 2 decimal places
Answer: 327.16cm² -
4. Ratio Combining two ratios
a:b is 7:9 and b:c is 6:1. Find a:b:c in its simplest form.
Answer: 14:18:3 -
5. Statistics Averages and range
Find the mean, median and range of: 87, 94, 63, 61, 25, 23, 18
Answer: Mean = 53, Median = 61, Range = 76