Keystones — Capstone
Five GCSE retrieval questions · 11 June 2019 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √320
Answer: 8√5 -
2. Algebra Completing the square
Complete the square: x² + 4.8x
Answer: (x + 2.4)² - 5.76 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 22cm, b = 20cm, angle = 45°
Answer: 155.6cm² -
4. Ratio Combining two ratios
a:b is 3:4 and b:c is 2:3. Find a:b:c.
Answer: 3:4:6 -
5. Statistics Averages and range
Find the mean, median and range of: 31, 96, 97, 32, 62, 31, 78, 83
Answer: Mean = 63.8, Median = 78, Range = 66