Keystones — Capstone
Five GCSE retrieval questions · 19 August 2020 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √128
Answer: 8√2 -
2. Algebra Completing the square
Complete the square: x² + 4.8x
Answer: (x + 2.4)² - 5.76 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 18cm, b = 27cm, angle = 53°
Answer: 194.cm² -
4. Ratio Combining two ratios
a:b is 4:3 and b:c is 1:2. Find a:b:c.
Answer: 8:6:12 -
5. Statistics Averages and range
Find the mean, median and range of: 32, 55, 49, 19, 47, 91, 19, 54
Answer: Mean = 45.8, Median = 49, Range = 72