Keystones — Capstone
Five GCSE retrieval questions · 28 October 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 2√18
Answer: 6√2 -
2. Algebra Completing the square
Complete the square: 3x² + 36x
Answer: 3(x + 6)² - 108 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 30cm, b = 17cm, angle = 77°. Give your answer to 2 decimal places
Answer: 248.46cm² -
4. Ratio Combining two ratios
a:b is 9:7 and b:c is 3:5. Find a:b:c in its simplest form.
Answer: 27:21:35 -
5. Statistics Averages and range
Find the mean, median and range of: 27, 59, 48, 10, 69, 44, 59, 75. Give your answer to 2 decimal places
Answer: Mean = 48.88, Median = 53.5, Range = 65