Keystones — Capstone
Five GCSE retrieval questions · 22 October 2019 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √200
Answer: 10√2 -
2. Algebra Completing the square
Complete the square: x² + 4.6x
Answer: (x + 2.3)² - 5.29 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 27cm, b = 14cm, angle = 50°
Answer: 144.8cm² -
4. Ratio Combining two ratios
a:b is 1:2 and b:c is 2:5. Find a:b:c.
Answer: 2:4:10 -
5. Statistics Averages and range
Find the mean, median and range of: 85, 25, 37, 96, 45, 34, 90, 94
Answer: Mean = 63.3, Median = 85, Range = 71