Keystones — Capstone
Five GCSE retrieval questions · 17 June 2017 · 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 - 3x + 8
Answer: (x - 3⁄2)² + 23⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 21cm, b = 18cm, angle = 58°. Give your answer to 2 decimal places
Answer: 160.28cm² -
4. Ratio Combining two ratios
a:b is 4:3 and b:c is 2:7. Find a:b:c in its simplest form.
Answer: 8:6:21 -
5. Statistics Averages and range
Find the mean, median and range of: 73, 76, 31, 26, 21, 45, 93, 98, 27. Give your answer to 2 decimal places
Answer: Mean = 54.44, Median = 45, Range = 77