Keystones — Capstone
Five GCSE retrieval questions · 21 October 2021 · 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 + 3.8x
Answer: (x + 1.9)² - 3.61 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 16cm, b = 23cm, angle = 73°
Answer: 176cm² -
4. Ratio Combining two ratios
a:b is 4:3 and b:c is 3:5. Find a:b:c.
Answer: 4:3:5 -
5. Statistics Averages and range
Find the mean, median and range of: 99, 59, 55, 11, 50, 27, 32, 83, 51
Answer: Mean = 51.9, Median = 51, Range = 88