Keystones — Capstone
Five GCSE retrieval questions · 30 April 2021 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √125
Answer: 5√5 -
2. Algebra Completing the square
Complete the square: x² + 4.2x
Answer: (x + 2.1)² - 4.41 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 16cm, b = 13cm, angle = 65°
Answer: 94.3cm² -
4. Ratio Combining two ratios
a:b is 1:2 and b:c is 2:3. Find a:b:c.
Answer: 2:4:6 -
5. Statistics Averages and range
Find the mean, median and range of: 40, 35, 54, 29, 59, 99, 84, 34
Answer: Mean = 54.3, Median = 54, Range = 70