Keystones — Capstone
Five GCSE retrieval questions · 20 January 2020 · 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 + 5.6x
Answer: (x + 2.8)² - 7.84 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 18cm, b = 15cm, angle = 77°
Answer: 131.5cm² -
4. Ratio Combining two ratios
a:b is 1:2 and b:c is 1:2. Find a:b:c.
Answer: 2:4:8 -
5. Statistics Averages and range
Find the mean, median and range of: 94, 84, 24, 72, 92, 96, 47
Answer: Mean = 72.7, Median = 84, Range = 72