Keystones — Capstone
Five GCSE retrieval questions · 31 December 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √475
Answer: 5√19 -
2. Algebra Completing the square
Complete the square: x² + 7x + 4
Answer: (x + 7⁄2)² - 33⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 15cm, b = 21cm, angle = 53°. Give your answer to 2 decimal places
Answer: 125.79cm² -
4. Ratio Combining two ratios
a:b is 6:5 and b:c is 2:5. Find a:b:c in its simplest form.
Answer: 12:10:25 -
5. Statistics Averages and range
Find the mean, median and range of: 50, 13, 19, 55, 56, 88, 60, 34, 71. Give your answer to 2 decimal places
Answer: Mean = 49.56, Median = 55, Range = 75