Keystones — Capstone
Five GCSE retrieval questions · 24 March 2019 · 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 + 5.8x
Answer: (x + 2.9)² - 8.41 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 20cm, b = 30cm, angle = 47°
Answer: 219.4cm² -
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: 65, 16, 93, 45, 95, 37, 64
Answer: Mean = 59.3, Median = 64, Range = 79