Keystones — Capstone
Five GCSE retrieval questions · 20 March 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √48
Answer: 4√3 -
2. Algebra Completing the square
Complete the square: 3x² + 18x + 12
Answer: 3(x + 3)² - 15 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 23cm, b = 21cm, angle = 79°. Give your answer to 2 decimal places
Answer: 237.06cm² -
4. Ratio Combining two ratios
a:b is 1:4 and b:c is 3:8. Find a:b:c in its simplest form.
Answer: 3:12:32 -
5. Statistics Averages and range
Find the mean, median and range of: 88, 52, 28, 62, 20, 64, 44, 70, 91. Give your answer to 2 decimal places
Answer: Mean = 57.67, Median = 62, Range = 71