Keystones — Capstone
Five GCSE retrieval questions · 24 December 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 = 16cm, b = 20cm, angle = 44°
Answer: 111.cm² -
4. Ratio Combining two ratios
a:b is 1:2 and b:c is 3:5. Find a:b:c.
Answer: 6:12:20 -
5. Statistics Averages and range
Find the mean, median and range of: 37, 56, 21, 67, 97, 82, 83, 69
Answer: Mean = 64, Median = 69, Range = 76