Keystones — Capstone
Five GCSE retrieval questions · 17 March 2020 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: √147
Answer: 7√3 -
2. Algebra Completing the square
Complete the square: x² + 3.8x
Answer: (x + 1.9)² - 3.61 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 27cm, b = 15cm, angle = 75°
Answer: 195.6cm² -
4. Ratio Combining two ratios
a:b is 3:2 and b:c is 4:3. Find a:b:c.
Answer: 6:4:3 -
5. Statistics Averages and range
Find the mean, median and range of: 62, 79, 76, 17, 29, 41, 78
Answer: Mean = 54.6, Median = 62, Range = 62