Question one, One child is divided into three pieces of sugar. How much sugar do five children need?

Question 2: One pencil is fifty cents, and three pencils are several cents.

Question 3: Plant three trees in one row and how many trees in five rows?

Stiffness of mathematics

Mathematical language is also difficult for beginners. How to make these words have more accurate meanings than everyday language also puzzles beginners. For example, the words "open" and "domain" have special meanings in mathematics.

Mathematical terms also include proper nouns such as embryo and integrability. But these special symbols and terms are used for a reason: mathematics needs accuracy more than everyday language. Mathematicians call this requirement for linguistic and logical accuracy "rigor".