Keystones — Capstone
Five GCSE retrieval questions · 23 June 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 4√275
Answer: 20√11 -
2. Algebra Completing the square
Complete the square: x² + 11x + 7
Answer: (x + 11⁄2)² - 93⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 30cm, b = 13cm, angle = 74°. Give your answer to 2 decimal places
Answer: 187.45cm² -
4. Ratio Combining two ratios
a:b is 2:5 and b:c is 8:9. Find a:b:c in its simplest form.
Answer: 16:40:45 -
5. Statistics Averages and range
Find the mean, median and range of: 63, 77, 85, 58, 98, 19, 10. Give your answer to 2 decimal places
Answer: Mean = 58.57, Median = 63, Range = 88