Ushbu 4 + 6 + 4 ifodani shunday guruhlangki, uni hisoblash juda oson bo‘lsin. Har bir guruhda 2 tadan son bo‘lsin va jami guruhlar 1 ta. Ortib qolgan sonni ifoda boshida yozing.
Masalan:
1) 37 + 45 + 63 = 45 + (37 + 63)
2) 7 + 8 + 3 = 8 + (7 + 3)
