Keystones — Capstone
Five GCSE retrieval questions · 27 July 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √325
Answer: 5√13 -
2. Algebra Completing the square
Complete the square: 5x² - 20x + 15
Answer: 5(x - 2)² - 5 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 21cm, b = 30cm, angle = 53°. Give your answer to 2 decimal places
Answer: 251.57cm² -
4. Ratio Combining two ratios
a:b is 8:3 and b:c is 4:5. Find a:b:c in its simplest form.
Answer: 32:12:15 -
5. Statistics Averages and range
Find the mean, median and range of: 30, 54, 46, 99, 77, 73, 74, 82, 40. Give your answer to 2 decimal places
Answer: Mean = 63.89, Median = 73, Range = 69