Keystones — Capstone
Five GCSE retrieval questions · 22 June 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 5√12
Answer: 10√3 -
2. Algebra Completing the square
Complete the square: 5x² - 20x - 5
Answer: 5(x - 2)² - 25 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 20cm, b = 21cm, angle = 76°. Give your answer to 2 decimal places
Answer: 203.76cm² -
4. Ratio Combining two ratios
a:b is 1:8 and b:c is 5:9. Find a:b:c in its simplest form.
Answer: 5:40:72 -
5. Statistics Averages and range
Find the mean, median and range of: 97, 22, 39, 70, 36, 58, 67. Give your answer to 2 decimal places
Answer: Mean = 55.57, Median = 58, Range = 75