Keystones — Capstone
Five GCSE retrieval questions · 21 April 2011 · 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 + 4
Answer: 3(x - 6)² - 104 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 15cm, b = 15cm, angle = 40°. Give your answer to 2 decimal places
Answer: 72.31cm² -
4. Ratio Combining two ratios
a:b is 1:3 and b:c is 8:3. Find a:b:c in its simplest form.
Answer: 8:24:9 -
5. Statistics Averages and range
Find the mean, median and range of: 62, 52, 44, 17, 37, 95, 67. Give your answer to 2 decimal places
Answer: Mean = 53.43, Median = 52, Range = 78