Keystones — Capstone
Five GCSE retrieval questions · 16 December 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 5√24
Answer: 10√6 -
2. Algebra Completing the square
Complete the square: 4x² + 24x + 15
Answer: 4(x + 3)² - 21 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 17cm, b = 21cm, angle = 72°. Give your answer to 2 decimal places
Answer: 169.76cm² -
4. Ratio Combining two ratios
a:b is 8:7 and b:c is 3:7. Find a:b:c in its simplest form.
Answer: 24:21:49 -
5. Statistics Averages and range
Find the mean, median and range of: 35, 58, 64, 30, 56, 98, 34, 29, 78. Give your answer to 2 decimal places
Answer: Mean = 53.56, Median = 56, Range = 69