We need to read numbers and symbols in mathematical formulas separately. Numbers 8, 3, 1, 7, plus sign and minus sign all need to be read. Among them, the minus sign is read as minus sign here, and the plus sign is read as plus sign here. Then, we need to read these numbers and symbols in the order in the formula. Therefore, -8-3+ 1-7 is pronounced as minus eight minus three plus one minus seven.
Another way of reading is to read symbols and numbers separately, such as -8-3+ 1-7, which can be read as negative eight, negative three, positive one and negative seven. Although this reading method is more complicated, it can express the meaning of mathematical formulas more clearly.
Importance of addition and subtraction:
1, basic math skills: addition and subtraction are the basis of math learning. In kindergartens and primary schools, students master basic mathematical concepts and skills by learning addition and subtraction. Addition and subtraction are the basis of counting and comparing sizes, and also the basis of learning more advanced mathematical concepts, such as algebra, geometry, probability and so on.
2. Application in life: Addition and subtraction can be seen everywhere in our daily life. For example, we need to calculate the price and change when shopping, the calculation time needs to be added or subtracted, and the calculation of wages and taxes needs to be added or subtracted.
3. Tools to solve problems: Addition and subtraction are tools to solve problems. Many practical problems can be solved by addition and subtraction. For example, to calculate the total score of a team or the average score of a class, we can use addition and subtraction.
4. Establish other concepts: addition and subtraction is not only a basic concept in mathematics, but also related to other concepts. For example, addition and subtraction are associated with units of measurement such as time, length and weight. Students can learn the application and transformation of these concepts while learning addition and subtraction.
Addition and subtraction play an important role in mathematics learning and daily life. Mastering the basic concepts and skills of addition and subtraction will not only help us improve our math scores, but also help us better understand and solve practical problems.