sentence: Numbers are used when things are measured.
sentences_before: Numbers are also used for other things besides counting.
sentences_after: Numbers are used to study how the world works. Mathematics is a way to use numbers to learn about the world and make things. The study of the rules of the natural world is called science. The work that uses numbers to make things is called engineering.
concept_name: number
headings: Number
categories: Basic English 850 words