Keystones — Capstone
Five GCSE retrieval questions · 31 October 2018 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √125
Answer: 5√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 = 15cm, b = 30cm, angle = 55°
Answer: 184.3cm² -
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: 72, 47, 63, 59, 67, 60, 52, 80, 97
Answer: Mean = 66.3, Median = 63, Range = 50