Keystones — Capstone
Five GCSE retrieval questions · 20 June 2020 · 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 = 16cm, b = 12cm, angle = 60°
Answer: 83.cm² -
4. Ratio Combining two ratios
a:b is 2:1 and b:c is 3:5. Find a:b:c.
Answer: 12:6:10 -
5. Statistics Averages and range
Find the mean, median and range of: 10, 36, 26, 24, 89, 34, 25, 40, 32
Answer: Mean = 35.1, Median = 32, Range = 79