The addition and subtraction formulas within ten are: one plus one gets two, two plus two gets four, three plus three gets six, four plus four gets eight, five plus five gets ten, one minus one gets zero, two minus one gets one, three minus one gets two, four minus one gets three, and five minus one gets four.

First, the formula of addition

1, one plus one equals two: 1+ 1=2. 2. Two plus two equals four: 2+2=4.

3. Three plus three equals six: 3+3=6. 4. Four plus four equals eight: 4+4=8.

Second, the subtraction formula

1, one minus one gets zero: 1- 1=0. 2. Two minus one equals one: 2- 1= 1.

3. Three minus one equals two: 3- 1=2. 4. Four minus one equals three: 4- 1=3.

Third, the expansion of the addition formula

1, five plus five equals ten: 5+5= 10. 2. Six plus four equals ten: 6+4= 10.

3. Seven plus three equals ten: 7+3= 10. 4. Eight plus two equals ten: 8+2= 10.

Fourthly, the extension of subtraction formula.

1, five minus one equals four: 5- 1=4. 2. Six minus two equals four: 6-2=4.

Three minus seven equals four: 7-3=4. 4. Eight minus four equals four: 8-4=4.

V. Application of addition and subtraction formulas

Learning addition formula is helpful to improve the calculation speed, and addition formula is the basis of elementary arithmetic. Mastering the addition formula is helpful to understand more complex mathematical concepts, and the addition formula can be applied to the calculation in daily life.

Sixth, the importance of addition and subtraction formula

Addition and subtraction formulas are the basis of mathematics learning. Mastering addition and subtraction formulas is helpful to improve calculation ability, and addition and subtraction formulas are very important to cultivate logical thinking ability. And it is widely used in daily life.

By learning to add and subtract formulas in ten minutes, you can improve your calculation speed and accuracy and lay a solid foundation for learning more advanced mathematics knowledge. At the same time, addition and subtraction formulas also have many practical applications in daily life, such as shopping and calculating time. Therefore, mastering the formula of addition and subtraction is very important for our study and life.