Keystones — Capstone
Five GCSE retrieval questions · 22 August 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 2√75
Answer: 10√3 -
2. Algebra Completing the square
Complete the square: 3x² + 24x
Answer: 3(x + 4)² - 48 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 12cm, b = 15cm, angle = 48°. Give your answer to 2 decimal places
Answer: 66.88cm² -
4. Ratio Combining two ratios
a:b is 7:6 and b:c is 5:3. Find a:b:c in its simplest form.
Answer: 35:30:18 -
5. Statistics Averages and range
Find the mean, median and range of: 60, 74, 81, 25, 21, 10, 11, 19. Give your answer to 2 decimal places
Answer: Mean = 37.63, Median = 23, Range = 71