Keystones — Capstone
Five GCSE retrieval questions · 6 September 2020 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √288
Answer: 12√2 -
2. Algebra Completing the square
Complete the square: x² + 3.4x
Answer: (x + 1.7)² - 2.89 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 21cm, b = 14cm, angle = 54°
Answer: 118.9cm² -
4. Ratio Combining two ratios
a:b is 4:3 and b:c is 3:5. Find a:b:c.
Answer: 4:3:5 -
5. Statistics Averages and range
Find the mean, median and range of: 23, 56, 44, 82, 79, 21, 10
Answer: Mean = 45, Median = 44, Range = 72