Keystones — Capstone
Five GCSE retrieval questions · 4 August 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √352
Answer: 4√22 -
2. Algebra Completing the square
Complete the square: 3x² - 18x - 3
Answer: 3(x - 3)² - 30 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 26cm, b = 15cm, angle = 65°. Give your answer to 2 decimal places
Answer: 176.73cm² -
4. Ratio Combining two ratios
a:b is 7:9 and b:c is 6:1. Find a:b:c in its simplest form.
Answer: 14:18:3 -
5. Statistics Averages and range
Find the mean, median and range of: 83, 83, 19, 99, 97, 97, 73, 26, 79. Give your answer to 2 decimal places
Answer: Mean = 72.89, Median = 83, Range = 80