Keystones — Capstone
Five GCSE retrieval questions · 7 August 2018 · 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 + 5.8x
Answer: (x + 2.9)² - 8.41 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 21cm, b = 28cm, angle = 71°
Answer: 278cm² -
4. Ratio Combining two ratios
a:b is 4:3 and b:c is 2:3. Find a:b:c.
Answer: 16:12:18 -
5. Statistics Averages and range
Find the mean, median and range of: 67, 32, 86, 10, 67, 16, 34, 40, 74
Answer: Mean = 47.3, Median = 40, Range = 76