Carry addition within 1 and 50: the same digits are aligned, starting from single digits, and every ten digits or more, the tenth digit should be increased by one. Don't forget to add one when you add up the tenth digit.

Subtraction of abdication within 2.50: align with the same digit and subtract from the single digit. If the single digits are not enough, borrow a ten from the ten digits and subtract it. Don't forget to borrow one when you subtract the number from the decimal number.

First, children's mathematics addition and subtraction methods

1, singing number method

This method helps children master the skills of addition and subtraction by turning addition or subtraction into a simple number game. Children can sing with their parents or teachers, starting with 1 and increasing in turn until the number to be calculated is reached. Then, parents or teachers teach their children how to add and subtract.

2, finger-assisted method

This method helps children understand the concept of addition and subtraction by calculating with their fingers. For example, when calculating 5 plus 3, the child can stretch out five fingers first, then three fingers, and finally count the total number of fingers. This method can help children intuitively understand the addition operation.

3, the story deduction method

This method helps children understand the application of addition and subtraction in real life by creating specific scenes or stories. For example, you can add and subtract apples, candy or other items, and let children understand the meaning of addition and subtraction through stories.

Second, the benefits of children learning mathematics addition and subtraction

1, improve children's math ability

Learning mathematical addition and subtraction is an important way to improve children's mathematical ability. By learning addition and subtraction, children can master basic mathematical concepts and calculation methods, laying a solid foundation for future mathematical learning.

2. Cultivate children's logical thinking ability

Learning mathematics addition and subtraction can cultivate children's logical thinking ability. Addition and subtraction is a logical operation. By learning addition and subtraction, children can learn to analyze problems, reason and judge, thus cultivating logical thinking ability.

3. Cultivate children's ability to solve problems.

Learning mathematics addition and subtraction can cultivate children's problem-solving ability. In real life, children will encounter many problems related to addition and subtraction. By learning addition and subtraction, children can learn how to solve these problems, thus improving their problem-solving ability.