Keystones — Capstone
Five GCSE retrieval questions · 1 December 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 + 5.6x
Answer: (x + 2.8)² - 7.84 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 20cm, b = 26cm, angle = 51°
Answer: 202.cm² -
4. Ratio Combining two ratios
a:b is 2:1 and b:c is 3:5. Find a:b:c.
Answer: 12:6:10 -
5. Statistics Averages and range
Find the mean, median and range of: 78, 31, 96, 68, 94, 74, 31, 88, 72
Answer: Mean = 70.2, Median = 74, Range = 65