Keystones — Capstone
Five GCSE retrieval questions · 15 January 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √294
Answer: 7√6 -
2. Algebra Completing the square
Complete the square: 2x² + 8x - 10
Answer: 2(x + 2)² - 18 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 23cm, b = 19cm, angle = 74°. Give your answer to 2 decimal places
Answer: 210.04cm² -
4. Ratio Combining two ratios
a:b is 7:4 and b:c is 6:1. Find a:b:c in its simplest form.
Answer: 21:12:2 -
5. Statistics Averages and range
Find the mean, median and range of: 47, 36, 88, 35, 51, 95, 57. Give your answer to 2 decimal places
Answer: Mean = 58.43, Median = 51, Range = 60