Keystones — Capstone
Five GCSE retrieval questions · 29 December 2018 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √288
Answer: 12√2 -
2. Algebra Completing the square
Complete the square: x² + 3.4x
Answer: (x + 1.7)² - 2.89 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 12cm, b = 20cm, angle = 66°
Answer: 109.6cm² -
4. Ratio Combining two ratios
a:b is 3:4 and b:c is 1:2. Find a:b:c.
Answer: 3:4:8 -
5. Statistics Averages and range
Find the mean, median and range of: 47, 26, 94, 41, 24, 22, 55, 12, 63
Answer: Mean = 42.7, Median = 41, Range = 82