Keystones — Capstone
Five GCSE retrieval questions · 10 May 2021 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √320
Answer: 8√5 -
2. Algebra Completing the square
Complete the square: x² + 3.2x
Answer: (x + 1.6)² - 2.56 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 13cm, b = 12cm, angle = 68°
Answer: 72.3cm² -
4. Ratio Combining two ratios
a:b is 2:1 and b:c is 1:3. Find a:b:c.
Answer: 4:2:6 -
5. Statistics Averages and range
Find the mean, median and range of: 25, 32, 72, 68, 62, 61, 85, 94
Answer: Mean = 62.4, Median = 68, Range = 69