Keystones — Capstone
Five GCSE retrieval questions · 23 March 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √756
Answer: 6√21 -
2. Algebra Completing the square
Complete the square: 5x² + 40x + 8
Answer: 5(x + 4)² - 72 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 20cm, b = 26cm, angle = 51°. Give your answer to 2 decimal places
Answer: 202.06cm² -
4. Ratio Combining two ratios
a:b is 1:3 and b:c is 7:3. Find a:b:c in its simplest form.
Answer: 7:21:9 -
5. Statistics Averages and range
Find the mean, median and range of: 47, 17, 57, 48, 42, 32, 99, 39. Give your answer to 2 decimal places
Answer: Mean = 47.63, Median = 44.5, Range = 82