Keystones — Capstone
Five GCSE retrieval questions · 12 April 2018 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √320
Answer: 8√5 -
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 = 21cm, b = 14cm, angle = 79°
Answer: 144.3cm² -
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: 69, 74, 31, 27, 80, 71, 88, 42, 14
Answer: Mean = 55.1, Median = 69, Range = 74