Keystones — Capstone
Five GCSE retrieval questions · 30 September 2019 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √128
Answer: 8√2 -
2. Algebra Completing the square
Complete the square: x² + 2.2x
Answer: (x + 1.1)² - 1.21 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 27cm, b = 23cm, angle = 76°
Answer: 301.3cm² -
4. Ratio Combining two ratios
a:b is 3:4 and b:c is 1:3. Find a:b:c.
Answer: 3:4:12 -
5. Statistics Averages and range
Find the mean, median and range of: 33, 33, 29, 53, 66, 23, 88, 85
Answer: Mean = 51.3, Median = 53, Range = 65