Keystones — Capstone
Five GCSE retrieval questions · 16 January 2019 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √242
Answer: 11√2 -
2. Algebra Completing the square
Complete the square: x² + 3.6x
Answer: (x + 1.8)² - 3.24 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 23cm, b = 22cm, angle = 58°
Answer: 214.6cm² -
4. Ratio Combining two ratios
a:b is 4:3 and b:c is 2:5. Find a:b:c.
Answer: 8:6:15 -
5. Statistics Averages and range
Find the mean, median and range of: 90, 69, 84, 57, 57, 37, 24, 88, 72
Answer: Mean = 64.2, Median = 69, Range = 66