Keystones — Capstone
Five GCSE retrieval questions · 6 February 2020 · 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 + 4.6x
Answer: (x + 2.3)² - 5.29 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 26cm, b = 27cm, angle = 45°
Answer: 248.2cm² -
4. Ratio Combining two ratios
a:b is 2:3 and b:c is 2:3. Find a:b:c.
Answer: 4:6:9 -
5. Statistics Averages and range
Find the mean, median and range of: 57, 31, 78, 94, 98, 96, 14, 94
Answer: Mean = 70.3, Median = 94, Range = 84