Keystones — Capstone
Five GCSE retrieval questions · 7 July 2018 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √147
Answer: 7√3 -
2. Algebra Completing the square
Complete the square: x² + 5.4x
Answer: (x + 2.7)² - 7.29 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 26cm, b = 25cm, angle = 57°
Answer: 272.6cm² -
4. Ratio Combining two ratios
a:b is 1:2 and b:c is 4:5. Find a:b:c.
Answer: 2:4:5 -
5. Statistics Averages and range
Find the mean, median and range of: 98, 31, 50, 36, 34, 59, 19, 28
Answer: Mean = 44.4, Median = 36, Range = 79