Keystones — Capstone
Five GCSE retrieval questions · 4 March 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 + 4.8x
Answer: (x + 2.4)² - 5.76 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 23cm, b = 23cm, angle = 79°
Answer: 259.6cm² -
4. Ratio Combining two ratios
a:b is 2:1 and b:c is 3:5. Find a:b:c.
Answer: 12:6:10 -
5. Statistics Averages and range
Find the mean, median and range of: 47, 26, 98, 33, 47, 43, 89
Answer: Mean = 54.7, Median = 47, Range = 72