Keystones — Capstone
Five GCSE retrieval questions · 13 February 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √405
Answer: 9√5 -
2. Algebra Completing the square
Complete the square: 3x² + 18x + 3
Answer: 3(x + 3)² - 24 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 21cm, b = 15cm, angle = 75°. Give your answer to 2 decimal places
Answer: 152.13cm² -
4. Ratio Combining two ratios
a:b is 1:3 and b:c is 7:8. Find a:b:c in its simplest form.
Answer: 7:21:24 -
5. Statistics Averages and range
Find the mean, median and range of: 61, 14, 66, 68, 47, 19, 41, 30
Answer: Mean = 43.25, Median = 44, Range = 54