Keystones — Capstone
Five GCSE retrieval questions · 20 May 2020 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √200
Answer: 10√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 = 27cm, b = 22cm, angle = 61°
Answer: 259.8cm² -
4. Ratio Combining two ratios
a:b is 3:4 and b:c is 1:3. Find a:b:c.
Answer: 3:4:12 -
5. Statistics Averages and range
Find the mean, median and range of: 93, 20, 82, 92, 55, 64, 93, 11, 87
Answer: Mean = 66.3, Median = 82, Range = 82