Keystones — Capstone
Five GCSE retrieval questions · 23 January 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 3√275
Answer: 15√11 -
2. Algebra Completing the square
Complete the square: x² + 3x - 10
Answer: (x + 3⁄2)² - 49⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 27cm, b = 21cm, angle = 44°. Give your answer to 2 decimal places
Answer: 196.94cm² -
4. Ratio Combining two ratios
a:b is 1:6 and b:c is 4:7. Find a:b:c in its simplest form.
Answer: 2:12:21 -
5. Statistics Averages and range
Find the mean, median and range of: 19, 63, 88, 64, 18, 85, 86. Give your answer to 2 decimal places
Answer: Mean = 60.43, Median = 64, Range = 70