Keystones — Capstone
Five GCSE retrieval questions · 8 January 2020 · 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 + 2.6x
Answer: (x + 1.3)² - 1.69 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 12cm, b = 25cm, angle = 42°
Answer: 100.4cm² -
4. Ratio Combining two ratios
a:b is 4:3 and b:c is 2:3. Find a:b:c.
Answer: 16:12:18 -
5. Statistics Averages and range
Find the mean, median and range of: 81, 12, 78, 100, 32, 71, 85, 92, 43
Answer: Mean = 66, Median = 78, Range = 88