20所小学内的加减法

7+9= 8+8= 5+8= 14-9= 17-6=

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

9+8= 4+6= 5+3= 6+8= 17-5=

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

14-6= 5+7= 4+7= 7+9= 15-8=

6+9= 8+4= 9+8= 8+5= 9+11=

16-7= 13-7= 7+4= 8+3= 17-6=

19-8= 8+5= 9+5= 8+6= 7+14=

8+2= 4+7= 3+9= 12-8= 5+8

3+5= 13-6= 6+9= 9+5= 13-8=

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

12-9= 9-3= 8+3= 5+7= 5+6=

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

10+6= 9+5= 10+4= 6+10= 8+5=

14-6= 7+2= 6+5= 6+8= 9+6=

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

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

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

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

13-6= 18-9= 11-7= 6+9= ( )+5=12

17-9= 13-6= 14-5 = 15-6= 18-( )=9

12-9= 12+8= 11-9= 4+8= 5+( )=14

16-4= 7+9= 16-7= 2+17= 11-( )=5

12-8= 17-8= 18-1= 17-8= 17-( )=10

15-7= 10-4 = 14+6 = 16-9= 14+( )=18

15+5= 16-8= 14-7 = 12+8 = ( )+8=12

8+6= 14-10 = 8+8= 14-9= ( )-12=3