When writing addition, start with one digit and align the same digits.

Introduction to addition

Addition (usually indicated by the plus sign "+") is one of the four basic arithmetic operations, and the others are subtraction, multiplication and division. Addition has several important properties. It is interchangeable, which means that the order is not important, it is interrelated, which means that when more than two numbers are added, the order in which the addition is performed is not important. Repeatedly adding 1 is the same as counting; Adding 0 will not change the result.

Brief introduction of pen calculation

Written calculation is the most commonly used calculation method in mathematics. Related calculation methods include mental calculation, oral calculation and so on. One of the teaching methods of mental arithmetic mathematics. A calculation method based on thinking and language activities without any tools. It can cultivate students' quick calculation ability and develop their attention, memory and thinking ability.

Writing calculation method

To align the same numbers, count from one number. If you add dozens, you will be promoted to a higher level; If the subtraction is not enough, subtract 1 from the high position. When this number is added to 10, it will decrease. Addition is one of the four basic operations, which refers to the calculation of combining two or more numbers and quantities into one number and quantity.

Advantages of written calculation

You can find out why you did something wrong and where you did it faster by writing. In fact, the hand and the brain are often out of sync, and the brain sometimes thinks differently from the handwriting. Pens are written on draft paper and exercise books. If you see the traces of changes, you will know whether you have made a mistake.