Keystones — Capstone
Five GCSE retrieval questions · 1 February 2019 · 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 + 5.4x
Answer: (x + 2.7)² - 7.29 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 24cm, b = 15cm, angle = 55°
Answer: 147.4cm² -
4. Ratio Combining two ratios
a:b is 4:3 and b:c is 2:3. Find a:b:c.
Answer: 8:6:9 -
5. Statistics Averages and range
Find the mean, median and range of: 90, 98, 46, 35, 69, 88, 66, 31, 80
Answer: Mean = 67, Median = 69, Range = 67