2+9= 3+8= 3+9= 4+7= 4+8= 4+9= 5+6=

5+7= 5+8= 5+9= 6+5= 6+6= 6+7= 6+8=

6+9= 7+4= 7+5= 7+6= 7+8=

7+9= 8+3= 8+4= 8+5= 8+6= 8+7= 8+9=

9+2= 9+3= 9+4= 9+5= 9+6= 9+7= 9+8= 9+9=

Extended data:

Primary school math jingle:

First, look at the large number added in one round within 20, divide it by the decimal, round it to 10, and add a fraction. Master the "ten-point method" and advocate the "recursive method". )?

Second, the abdication within 20 MINUS the abdication within 20 toys, the oral calculation method is simple. Ten people return one, one makes up, and the writing is accurate and fast. ?

Third, the meaning of addition, the vertical calculation of two numbers combined with addition, the result of addition is called sum. Don't forget the numbers on the right, one for every ten. ?

Fourth, the meaning of subtraction vertical calculation uses subtraction from large to small, and the result of subtraction is called difference. Digital alignment starts from the right, and when it is not enough, take the front position. ?

Verb (verb's abbreviation) Two-digit multiplication is not difficult. There are three points in the calculation process: the multiplier must be calculated first and then multiplied by ten digits. The last digit of the product is the key and must be opposite to the ten digits; After the two products are added up, calculate the number of layers in your mind. ?

6. Divide by two digits. Look at two digits. Two digits are not enough to divide three digits. The remainder is greater than the divisor except the quotient. 2 3 5 7 1 1 13 17 19 23 29 3 1 37 4 1 43 47 53 59 6 1 67 7 1 73 79 83 89 97。