Keystones — Capstone
Five GCSE retrieval questions · 8 July 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 2√44
Answer: 4√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 = 21cm, b = 29cm, angle = 46°. Give your answer to 2 decimal places
Answer: 219.04cm² -
4. Ratio Combining two ratios
a:b is 5:6 and b:c is 9:7. Find a:b:c in its simplest form.
Answer: 15:18:14 -
5. Statistics Averages and range
Find the mean, median and range of: 68, 22, 34, 74, 37, 38, 78, 84. Give your answer to 2 decimal places
Answer: Mean = 54.38, Median = 53, Range = 62