Keystones — Capstone
Five GCSE retrieval questions · 27 December 2019 · 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 + 5x
Answer: (x + 2.5)² - 6.25 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 21cm, b = 19cm, angle = 48°
Answer: 148.3cm² -
4. Ratio Combining two ratios
a:b is 3:4 and b:c is 4:3. Find a:b:c.
Answer: 3:4:3 -
5. Statistics Averages and range
Find the mean, median and range of: 50, 76, 42, 77, 14, 22, 23
Answer: Mean = 43.4, Median = 42, Range = 63