Keystones — Capstone
Five GCSE retrieval questions · 3 May 2018 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √243
Answer: 9√3 -
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 = 23cm, b = 30cm, angle = 62°
Answer: 304.6cm² -
4. Ratio Combining two ratios
a:b is 2:1 and b:c is 2:3. Find a:b:c.
Answer: 8:4:6 -
5. Statistics Averages and range
Find the mean, median and range of: 83, 76, 87, 22, 40, 77, 82, 55
Answer: Mean = 65.3, Median = 77, Range = 65