Keystones — Capstone
Five GCSE retrieval questions · 18 December 2019 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: √147
Answer: 7√3 -
2. Algebra Completing the square
Complete the square: x² + 4x
Answer: (x + 2)² - 4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 24cm, b = 18cm, angle = 49°
Answer: 163cm² -
4. Ratio Combining two ratios
a:b is 4:3 and b:c is 2:3. Find a:b:c.
Answer: 16:12:18 -
5. Statistics Averages and range
Find the mean, median and range of: 86, 36, 61, 81, 17, 28, 75, 33
Answer: Mean = 52.1, Median = 61, Range = 69