Keystones — Capstone
Five GCSE retrieval questions · 4 September 2021 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √243
Answer: 9√3 -
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 = 13cm, b = 22cm, angle = 60°
Answer: 123.8cm² -
4. Ratio Combining two ratios
a:b is 1:2 and b:c is 1:2. Find a:b:c.
Answer: 6:12:24 -
5. Statistics Averages and range
Find the mean, median and range of: 19, 67, 19, 99, 23, 70, 62
Answer: Mean = 51.3, Median = 62, Range = 80