Keystones — Capstone
Five GCSE retrieval questions · 7 December 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √490
Answer: 7√10 -
2. Algebra Completing the square
Complete the square: 3x² + 6x - 14
Answer: 3(x + 1)² - 17 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 19cm, b = 16cm, angle = 79°. Give your answer to 2 decimal places
Answer: 149.21cm² -
4. Ratio Combining two ratios
a:b is 7:5 and b:c is 7:4. Find a:b:c in its simplest form.
Answer: 49:35:20 -
5. Statistics Averages and range
Find the mean, median and range of: 44, 62, 23, 95, 13, 43, 68, 17, 48. Give your answer to 2 decimal places
Answer: Mean = 45.89, Median = 44, Range = 82