Keystones — Capstone
Five GCSE retrieval questions · 14 May 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 + 5.8x
Answer: (x + 2.9)² - 8.41 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 12cm, b = 30cm, angle = 65°
Answer: 163.cm² -
4. Ratio Combining two ratios
a:b is 2:3 and b:c is 3:4. Find a:b:c.
Answer: 2:3:4 -
5. Statistics Averages and range
Find the mean, median and range of: 72, 55, 16, 40, 66, 79, 85, 18, 37
Answer: Mean = 52, Median = 55, Range = 69