Keystones — Capstone
Five GCSE retrieval questions · 24 May 2020 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √162
Answer: 9√2 -
2. Algebra Completing the square
Complete the square: x² + 2.6x
Answer: (x + 1.3)² - 1.69 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 13cm, b = 14cm, angle = 62°
Answer: 80.3cm² -
4. Ratio Combining two ratios
a:b is 3:2 and b:c is 4:5. Find a:b:c.
Answer: 6:4:5 -
5. Statistics Averages and range
Find the mean, median and range of: 32, 19, 60, 90, 18, 97, 44, 22, 33
Answer: Mean = 46.1, Median = 33, Range = 79