Keystones — Capstone
Five GCSE retrieval questions · 3 May 2019 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √192
Answer: 8√3 -
2. Algebra Completing the square
Complete the square: x² + 4.2x
Answer: (x + 2.1)² - 4.41 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 24cm, b = 14cm, angle = 57°
Answer: 140.9cm² -
4. Ratio Combining two ratios
a:b is 2:3 and b:c is 3:4. Find a:b:c.
Answer: 2:3:4 -
5. Statistics Averages and range
Find the mean, median and range of: 80, 88, 45, 31, 19, 44, 87, 35, 25
Answer: Mean = 50.4, Median = 44, Range = 69