Keystones — Capstone
Five GCSE retrieval questions · 7 December 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 + 3.4x
Answer: (x + 1.7)² - 2.89 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 29cm, b = 23cm, angle = 53°
Answer: 266.3cm² -
4. Ratio Combining two ratios
a:b is 3:4 and b:c is 3:5. Find a:b:c.
Answer: 9:12:20 -
5. Statistics Averages and range
Find the mean, median and range of: 93, 73, 34, 84, 76, 55, 96, 77
Answer: Mean = 73.5, Median = 77, Range = 62