Keystones — Capstone
Five GCSE retrieval questions · 3 August 2021 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √162
Answer: 9√2 -
2. Algebra Completing the square
Complete the square: x² + 2.2x
Answer: (x + 1.1)² - 1.21 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 15cm, b = 17cm, angle = 49°
Answer: 96.2cm² -
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: 19, 19, 49, 63, 56, 68, 92, 51
Answer: Mean = 52.1, Median = 56, Range = 73