Keystones — Capstone
Five GCSE retrieval questions · 10 February 2019 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √128
Answer: 8√2 -
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 = 13cm, b = 25cm, angle = 57°
Answer: 136.3cm² -
4. Ratio Combining two ratios
a:b is 3:2 and b:c is 4:3. Find a:b:c.
Answer: 6:4:3 -
5. Statistics Averages and range
Find the mean, median and range of: 54, 92, 24, 97, 73, 95, 83, 85, 79
Answer: Mean = 75.8, Median = 83, Range = 73