Keystones — Capstone
Five GCSE retrieval questions · 21 January 2020 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √147
Answer: 7√3 -
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 = 23cm, b = 22cm, angle = 53°
Answer: 202.cm² -
4. Ratio Combining two ratios
a:b is 2:1 and b:c is 3:5. Find a:b:c.
Answer: 12:6:10 -
5. Statistics Averages and range
Find the mean, median and range of: 89, 51, 88, 49, 28, 85, 65, 58
Answer: Mean = 64.1, Median = 65, Range = 61