Keystones — Capstone
Five GCSE retrieval questions · 14 September 2018 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √288
Answer: 12√2 -
2. Algebra Completing the square
Complete the square: x² + 2.8x
Answer: (x + 1.4)² - 1.96 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 29cm, b = 26cm, angle = 80°
Answer: 371.3cm² -
4. Ratio Combining two ratios
a:b is 3:2 and b:c is 4:5. Find a:b:c.
Answer: 6:4:5 -
5. Statistics Averages and range
Find the mean, median and range of: 52, 31, 50, 84, 97, 22, 19, 13, 22
Answer: Mean = 43.3, Median = 31, Range = 84