Keystones — Capstone
Five GCSE retrieval questions · 23 June 2018 · 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 + 5.6x
Answer: (x + 2.8)² - 7.84 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 25cm, b = 23cm, angle = 47°
Answer: 210.3cm² -
4. Ratio Combining two ratios
a:b is 2:3 and b:c is 2:5. Find a:b:c.
Answer: 4:6:15 -
5. Statistics Averages and range
Find the mean, median and range of: 82, 100, 70, 38, 76, 11, 66
Answer: Mean = 63.3, Median = 70, Range = 89