Keystones — Capstone
Five GCSE retrieval questions · 13 October 2018 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √192
Answer: 8√3 -
2. Algebra Completing the square
Complete the square: x² + 5.8x
Answer: (x + 2.9)² - 8.41 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 30cm, b = 17cm, angle = 42°
Answer: 170.6cm² -
4. Ratio Combining two ratios
a:b is 4:3 and b:c is 4:5. Find a:b:c.
Answer: 16:12:15 -
5. Statistics Averages and range
Find the mean, median and range of: 52, 85, 81, 11, 55, 62, 49, 54, 29
Answer: Mean = 53.1, Median = 54, Range = 74