Keystones — Capstone
Five GCSE retrieval questions · 11 April 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √288
Answer: 12√2 -
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 = 27cm, b = 27cm, angle = 78°. Give your answer to 2 decimal places
Answer: 356.53cm² -
4. Ratio Combining two ratios
a:b is 7:6 and b:c is 5:4. Find a:b:c in its simplest form.
Answer: 35:30:24 -
5. Statistics Averages and range
Find the mean, median and range of: 28, 30, 23, 94, 83, 58, 26, 97, 48. Give your answer to 2 decimal places
Answer: Mean = 54.11, Median = 48, Range = 74