Keystones — Capstone
Five GCSE retrieval questions · 21 February 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √891
Answer: 9√11 -
2. Algebra Completing the square
Complete the square: x² + x + 10
Answer: (x + 1⁄2)² + 39⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 12cm, b = 13cm, angle = 50°. Give your answer to 2 decimal places
Answer: 59.75cm² -
4. Ratio Combining two ratios
a:b is 8:9 and b:c is 5:8. Find a:b:c in its simplest form.
Answer: 40:45:72 -
5. Statistics Averages and range
Find the mean, median and range of: 84, 98, 67, 32, 79, 96, 59. Give your answer to 2 decimal places
Answer: Mean = 73.57, Median = 79, Range = 66