Keystones — Capstone
Five GCSE retrieval questions · 19 April 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √375
Answer: 5√15 -
2. Algebra Completing the square
Complete the square: 3x² + 30x + 6
Answer: 3(x + 5)² - 69 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 21cm, b = 24cm, angle = 78°. Give your answer to 2 decimal places
Answer: 246.49cm² -
4. Ratio Combining two ratios
a:b is 7:9 and b:c is 4:9. Find a:b:c in its simplest form.
Answer: 28:36:81 -
5. Statistics Averages and range
Find the mean, median and range of: 78, 89, 93, 69, 42, 90, 19. Give your answer to 2 decimal places
Answer: Mean = 68.57, Median = 78, Range = 74