Keystones — Capstone
Five GCSE retrieval questions · 15 June 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 2√150
Answer: 10√6 -
2. Algebra Completing the square
Complete the square: 2x² - 20x - 9
Answer: 2(x - 5)² - 59 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 21cm, b = 12cm, angle = 59°. Give your answer to 2 decimal places
Answer: 108cm² -
4. Ratio Combining two ratios
a:b is 1:8 and b:c is 6:7. Find a:b:c in its simplest form.
Answer: 3:24:28 -
5. Statistics Averages and range
Find the mean, median and range of: 20, 96, 19, 80, 19, 50, 30, 59, 81. Give your answer to 2 decimal places
Answer: Mean = 50.44, Median = 50, Range = 77