Keystones — Capstone
Five GCSE retrieval questions · 29 January 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √931
Answer: 7√19 -
2. Algebra Completing the square
Complete the square: 3x² + 30x + 1
Answer: 3(x + 5)² - 74 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 25cm, b = 26cm, angle = 70°. Give your answer to 2 decimal places
Answer: 305.4cm² -
4. Ratio Combining two ratios
a:b is 3:8 and b:c is 3:8. Find a:b:c in its simplest form.
Answer: 9:24:64 -
5. Statistics Averages and range
Find the mean, median and range of: 23, 70, 73, 56, 61, 51, 97, 26. Give your answer to 2 decimal places
Answer: Mean = 57.13, Median = 58.5, Range = 74