Keystones — Capstone
Five GCSE retrieval questions · 17 September 2019 · 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 = 12cm, b = 15cm, angle = 43°
Answer: 61.4cm² -
4. Ratio Combining two ratios
a:b is 2:3 and b:c is 1:3. Find a:b:c.
Answer: 4:6:18 -
5. Statistics Averages and range
Find the mean, median and range of: 55, 66, 86, 33, 79, 50, 30
Answer: Mean = 57, Median = 55, Range = 56