Keystones — Capstone
Five GCSE retrieval questions · 26 October 2021 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √320
Answer: 8√5 -
2. Algebra Completing the square
Complete the square: x² + 5x
Answer: (x + 2.5)² - 6.25 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 30cm, b = 30cm, angle = 53°
Answer: 359.4cm² -
4. Ratio Combining two ratios
a:b is 2:3 and b:c is 4:5. Find a:b:c.
Answer: 8:12:15 -
5. Statistics Averages and range
Find the mean, median and range of: 32, 73, 80, 40, 66, 32, 17, 32, 22
Answer: Mean = 43.8, Median = 32, Range = 63