Keystones — Capstone
Five GCSE retrieval questions · 22 April 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √896
Answer: 8√14 -
2. Algebra Completing the square
Complete the square: 3x² - 30x + 12
Answer: 3(x - 5)² - 63 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 28cm, b = 27cm, angle = 80°. Give your answer to 2 decimal places
Answer: 372.26cm² -
4. Ratio Combining two ratios
a:b is 2:5 and b:c is 4:9. Find a:b:c in its simplest form.
Answer: 8:20:45 -
5. Statistics Averages and range
Find the mean, median and range of: 43, 39, 97, 66, 17, 78, 48. Give your answer to 2 decimal places
Answer: Mean = 55.43, Median = 48, Range = 80