Keystones — Capstone
Five GCSE retrieval questions · 23 November 2020 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √98
Answer: 7√2 -
2. Algebra Completing the square
Complete the square: x² + 3.6x
Answer: (x + 1.8)² - 3.24 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 15cm, b = 26cm, angle = 42°
Answer: 130.5cm² -
4. Ratio Combining two ratios
a:b is 2:1 and b:c is 1:3. Find a:b:c.
Answer: 4:2:6 -
5. Statistics Averages and range
Find the mean, median and range of: 82, 54, 42, 82, 88, 21, 13
Answer: Mean = 54.6, Median = 54, Range = 75