(8+10)-7=11
(18-13)+6=11
(7+12)-8=11
(16-12)+7=11
1. 10+8-7=11
2. 18=9*2
(13+9):2=11
3. 12=6*2
7+6-2=11
4. 12=6*2
(16+6):2=11
(8+10)-7=11
(18-13)+6=11
(7+12)-8=11
(16-12)+7=11
1. 10+8-7=11
2. 18=9*2
(13+9):2=11
3. 12=6*2
7+6-2=11
4. 12=6*2
(16+6):2=11