Keystones — Capstone
Five GCSE retrieval questions · 20 July 2020 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: √320
Answer: 8√5 -
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 = 30cm, b = 18cm, angle = 71°
Answer: 255.3cm² -
4. Ratio Combining two ratios
a:b is 2:1 and b:c is 2:3. Find a:b:c.
Answer: 4:2:3 -
5. Statistics Averages and range
Find the mean, median and range of: 13, 20, 62, 61, 61, 85, 63, 89, 73
Answer: Mean = 58.6, Median = 62, Range = 76