When we babble, some parents or teachers begin to teach us some simple mathematical calculations. The most common is the simple mathematical calculation of 1+ 1=2, but usually in the first or second grade of primary school, a special math teacher will teach us some mathematical calculations. Primary school math teachers usually use an addition and subtraction formula table when teaching these primary school students mathematical addition, which is the most effective and simple way for primary school students to learn. The addition and subtraction formulas within 10 in the addition and subtraction formula table, such as1+1= 2,2+1= 3,3+1= 4,4+1= 5, are easy for pupils to remember.