Keystones — Capstone
Five GCSE retrieval questions · 24 October 2018 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √128
Answer: 8√2 -
2. Algebra Completing the square
Complete the square: x² + 4.2x
Answer: (x + 2.1)² - 4.41 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 29cm, b = 14cm, angle = 53°
Answer: 162.cm² -
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: 23, 74, 58, 80, 81, 81, 47, 26
Answer: Mean = 58.8, Median = 74, Range = 58