Keystones — Capstone
Five GCSE retrieval questions · 24 May 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √250
Answer: 5√10 -
2. Algebra Completing the square
Complete the square: 3x² + 12x - 13
Answer: 3(x + 2)² - 25 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 14cm, b = 21cm, angle = 72°. Give your answer to 2 decimal places
Answer: 139.81cm² -
4. Ratio Combining two ratios
a:b is 3:4 and b:c is 7:4. Find a:b:c in its simplest form.
Answer: 21:28:16 -
5. Statistics Averages and range
Find the mean, median and range of: 12, 17, 88, 55, 69, 26, 99, 19. Give your answer to 2 decimal places
Answer: Mean = 48.13, Median = 40.5, Range = 87