Keystones — Capstone
Five GCSE retrieval questions · 29 May 2018 · 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 + 3.8x
Answer: (x + 1.9)² - 3.61 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 26cm, b = 30cm, angle = 79°
Answer: 382.8cm² -
4. Ratio Combining two ratios
a:b is 2:1 and b:c is 2:3. Find a:b:c.
Answer: 8:4:6 -
5. Statistics Averages and range
Find the mean, median and range of: 28, 17, 25, 59, 73, 15, 63
Answer: Mean = 40, Median = 28, Range = 58