Keystones — Capstone
Five GCSE retrieval questions · 15 May 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: x² + x
Answer: (x + 1⁄2)² - 1⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 16cm, b = 13cm, angle = 53°. Give your answer to 2 decimal places
Answer: 83.06cm² -
4. Ratio Combining two ratios
a:b is 1:6 and b:c is 5:7. Find a:b:c in its simplest form.
Answer: 5:30:42 -
5. Statistics Averages and range
Find the mean, median and range of: 84, 43, 70, 62, 23, 42, 24, 33, 43. Give your answer to 2 decimal places
Answer: Mean = 47.11, Median = 43, Range = 61