Keystones — Capstone
Five GCSE retrieval questions · 12 January 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √272
Answer: 4√17 -
2. Algebra Completing the square
Complete the square: x² + 11x - 12
Answer: (x + 11⁄2)² - 169⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 19cm, b = 17cm, angle = 43°. Give your answer to 2 decimal places
Answer: 110.14cm² -
4. Ratio Combining two ratios
a:b is 1:6 and b:c is 9:7. Find a:b:c in its simplest form.
Answer: 3:18:14 -
5. Statistics Averages and range
Find the mean, median and range of: 88, 14, 16, 88, 98, 98, 79, 61, 69. Give your answer to 2 decimal places
Answer: Mean = 67.89, Median = 79, Range = 84