Keystones — Capstone
Five GCSE retrieval questions · 23 September 2019 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √147
Answer: 7√3 -
2. Algebra Completing the square
Complete the square: x² + 2.2x
Answer: (x + 1.1)² - 1.21 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 17cm, b = 28cm, angle = 44°
Answer: 165.3cm² -
4. Ratio Combining two ratios
a:b is 3:2 and b:c is 4:3. Find a:b:c.
Answer: 6:4:3 -
5. Statistics Averages and range
Find the mean, median and range of: 56, 27, 81, 36, 79, 87, 58, 18, 90
Answer: Mean = 59.1, Median = 58, Range = 72