Keystones — Capstone
Five GCSE retrieval questions · 28 September 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 + 2.6x
Answer: (x + 1.3)² - 1.69 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 25cm, b = 17cm, angle = 61°
Answer: 185.9cm² -
4. Ratio Combining two ratios
a:b is 2:3 and b:c is 2:3. Find a:b:c.
Answer: 8:12:18 -
5. Statistics Averages and range
Find the mean, median and range of: 94, 94, 77, 17, 68, 71, 56
Answer: Mean = 68.1, Median = 71, Range = 77