Keystones — Capstone
Five GCSE retrieval questions · 21 December 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 + 3.2x
Answer: (x + 1.6)² - 2.56 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 21cm, b = 12cm, angle = 51°
Answer: 97.9cm² -
4. Ratio Combining two ratios
a:b is 3:4 and b:c is 2:5. Find a:b:c.
Answer: 3:4:10 -
5. Statistics Averages and range
Find the mean, median and range of: 35, 43, 79, 49, 97, 32, 79, 11
Answer: Mean = 53.1, Median = 49, Range = 86