Keystones — Capstone
Five GCSE retrieval questions · 28 December 2018 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √243
Answer: 9√3 -
2. Algebra Completing the square
Complete the square: x² + 3.2x
Answer: (x + 1.6)² - 2.56 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 15cm, b = 18cm, angle = 60°
Answer: 116.9cm² -
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: 35, 29, 99, 81, 44, 45, 25, 26
Answer: Mean = 48, Median = 44, Range = 74