1. (374+712)+626 = 1712
374 + 626 = 1000 , 1000 + 712 = 1712
2. 999+(901+2200) = 3100
999 + 901 = 1900 , 1900 + 2200 = 3100
3. (3355+7777)+2223
7777 + 2223 = 10000 , 10000 + 3355 = 13355
1. (374+712)+626 = 1712
374 + 626 = 1000 , 1000 + 712 = 1712
2. 999+(901+2200) = 3100
999 + 901 = 1900 , 1900 + 2200 = 3100
3. (3355+7777)+2223
7777 + 2223 = 10000 , 10000 + 3355 = 13355