Keystones — Capstone
Five GCSE retrieval questions · 28 December 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √208
Answer: 4√13 -
2. Algebra Completing the square
Complete the square: 3x² - 18x - 6
Answer: 3(x - 3)² - 33 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 22cm, b = 14cm, angle = 75°. Give your answer to 2 decimal places
Answer: 148.75cm² -
4. Ratio Combining two ratios
a:b is 1:2 and b:c is 7:1. Find a:b:c in its simplest form.
Answer: 7:14:2 -
5. Statistics Averages and range
Find the mean, median and range of: 60, 75, 50, 19, 67, 16, 96, 48. Give your answer to 2 decimal places
Answer: Mean = 53.88, Median = 55, Range = 80