Keystones — Capstone
Five GCSE retrieval questions · 23 May 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 + 5.2x
Answer: (x + 2.6)² - 6.76 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 30cm, b = 26cm, angle = 61°
Answer: 341.cm² -
4. Ratio Combining two ratios
a:b is 2:3 and b:c is 4:3. Find a:b:c.
Answer: 8:12:9 -
5. Statistics Averages and range
Find the mean, median and range of: 65, 70, 31, 60, 57, 47, 97, 78, 21
Answer: Mean = 58.4, Median = 60, Range = 76