Keystones — Capstone
Five GCSE retrieval questions · 21 February 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √792
Answer: 6√22 -
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 = 23cm, b = 26cm, angle = 80°. Give your answer to 2 decimal places
Answer: 294.46cm² -
4. Ratio Combining two ratios
a:b is 7:6 and b:c is 5:2. Find a:b:c in its simplest form.
Answer: 35:30:12 -
5. Statistics Averages and range
Find the mean, median and range of: 97, 56, 31, 23, 45, 13, 63, 47. Give your answer to 2 decimal places
Answer: Mean = 46.88, Median = 46, Range = 84