Keystones — Capstone
Five GCSE retrieval questions · 23 March 2020 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √320
Answer: 8√5 -
2. Algebra Completing the square
Complete the square: x² + 5.2x
Answer: (x + 2.6)² - 6.76 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 25cm, b = 18cm, angle = 64°
Answer: 202.2cm² -
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: 77, 27, 30, 77, 92, 19, 18, 53, 25
Answer: Mean = 46.4, Median = 30, Range = 74