Keystones — Capstone
Five GCSE retrieval questions · 29 September 2019 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √200
Answer: 10√2 -
2. Algebra Completing the square
Complete the square: x² + 6x
Answer: (x + 3)² - 9 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 17cm, b = 26cm, angle = 77°
Answer: 215.3cm² -
4. Ratio Combining two ratios
a:b is 3:4 and b:c is 1:3. Find a:b:c.
Answer: 3:4:12 -
5. Statistics Averages and range
Find the mean, median and range of: 11, 98, 40, 47, 32, 14, 35
Answer: Mean = 39.6, Median = 35, Range = 87