Keystones — Capstone
Five GCSE retrieval questions · 9 September 2019 · 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 + 2.8x
Answer: (x + 1.4)² - 1.96 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 17cm, b = 20cm, angle = 54°
Answer: 137.5cm² -
4. Ratio Combining two ratios
a:b is 4:3 and b:c is 2:3. Find a:b:c.
Answer: 8:6:9 -
5. Statistics Averages and range
Find the mean, median and range of: 50, 98, 12, 58, 42, 97, 97
Answer: Mean = 64.9, Median = 58, Range = 86