Keystones — Capstone
Five GCSE retrieval questions · 18 September 2018 · 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 + 4.6x
Answer: (x + 2.3)² - 5.29 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 17cm, b = 19cm, angle = 56°
Answer: 133.9cm² -
4. Ratio Combining two ratios
a:b is 2:1 and b:c is 2:5. Find a:b:c.
Answer: 4:2:5 -
5. Statistics Averages and range
Find the mean, median and range of: 40, 23, 56, 77, 93, 90, 14, 41, 13
Answer: Mean = 49.7, Median = 41, Range = 80