Keystones — Capstone
Five GCSE retrieval questions · 8 June 2018 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √98
Answer: 7√2 -
2. Algebra Completing the square
Complete the square: x² + 6x
Answer: (x + 3)² - 9 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 18cm, b = 27cm, angle = 70°
Answer: 228.3cm² -
4. Ratio Combining two ratios
a:b is 2:1 and b:c is 4:5. Find a:b:c.
Answer: 8:4:5 -
5. Statistics Averages and range
Find the mean, median and range of: 62, 41, 16, 52, 46, 24, 98
Answer: Mean = 48.4, Median = 46, Range = 82