Keystones — Capstone
Five GCSE retrieval questions · 25 April 2020 · 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 + 2.8x
Answer: (x + 1.4)² - 1.96 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 21cm, b = 30cm, angle = 79°
Answer: 309.2cm² -
4. Ratio Combining two ratios
a:b is 4:3 and b:c is 1:2. Find a:b:c.
Answer: 4:3:6 -
5. Statistics Averages and range
Find the mean, median and range of: 50, 99, 36, 73, 56, 87, 43, 46
Answer: Mean = 61.3, Median = 56, Range = 63