Keystones — Capstone
Five GCSE retrieval questions · 20 November 2022 · 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 + 5.6x
Answer: (x + 2.8)² - 7.84 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 30cm, b = 14cm, angle = 43°
Answer: 143.2cm² -
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: 48, 44, 88, 91, 14, 73, 74, 38, 46
Answer: Mean = 57.3, Median = 48, Range = 77