Keystones — Capstone
Five GCSE retrieval questions · 27 September 2018 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √192
Answer: 8√3 -
2. Algebra Completing the square
Complete the square: x² + 2.4x
Answer: (x + 1.2)² - 1.44 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 23cm, b = 16cm, angle = 63°
Answer: 163.9cm² -
4. Ratio Combining two ratios
a:b is 3:2 and b:c is 1:3. Find a:b:c.
Answer: 3:2:6 -
5. Statistics Averages and range
Find the mean, median and range of: 84, 60, 93, 48, 49, 34, 24
Answer: Mean = 56, Median = 49, Range = 69