Keystones — Capstone
Five GCSE retrieval questions · 19 May 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √200
Answer: 10√2 -
2. Algebra Completing the square
Complete the square: 5x² + 30x + 5
Answer: 5(x + 3)² - 40 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 15cm, b = 17cm, angle = 52°. Give your answer to 2 decimal places
Answer: 100.47cm² -
4. Ratio Combining two ratios
a:b is 7:6 and b:c is 8:9. Find a:b:c in its simplest form.
Answer: 28:24:27 -
5. Statistics Averages and range
Find the mean, median and range of: 19, 51, 76, 37, 89, 59, 27, 64, 23. Give your answer to 2 decimal places
Answer: Mean = 49.44, Median = 51, Range = 70