Keystones — Capstone
Five GCSE retrieval questions · 24 December 2021 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √98
Answer: 7√2 -
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 = 28cm, b = 15cm, angle = 73°
Answer: 200.8cm² -
4. Ratio Combining two ratios
a:b is 2:3 and b:c is 4:5. Find a:b:c.
Answer: 8:12:15 -
5. Statistics Averages and range
Find the mean, median and range of: 97, 77, 28, 56, 95, 64, 46
Answer: Mean = 66.1, Median = 64, Range = 69