Keystones — Capstone
Five GCSE retrieval questions · 22 December 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 2√63
Answer: 6√7 -
2. Algebra Completing the square
Complete the square: 4x² + 40x + 13
Answer: 4(x + 5)² - 87 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 25cm, b = 22cm, angle = 53°. Give your answer to 2 decimal places
Answer: 219.62cm² -
4. Ratio Combining two ratios
a:b is 5:6 and b:c is 5:6. Find a:b:c in its simplest form.
Answer: 25:30:36 -
5. Statistics Averages and range
Find the mean, median and range of: 84, 64, 24, 26, 68, 83, 69, 69, 65. Give your answer to 2 decimal places
Answer: Mean = 61.33, Median = 68, Range = 60