Keystones — Capstone
Five GCSE retrieval questions · 16 September 2020 · 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 = 30cm, b = 21cm, angle = 63°
Answer: 280.7cm² -
4. Ratio Combining two ratios
a:b is 2:3 and b:c is 4:3. Find a:b:c.
Answer: 8:12:9 -
5. Statistics Averages and range
Find the mean, median and range of: 59, 37, 31, 97, 91, 53, 22
Answer: Mean = 55.7, Median = 53, Range = 75