1. Sondan yigʻindini ayirish qonuni:
a-(b+c)=a-b-c
Misol: 35-(15+7)=35-15-7=20-7=13.
2. Yigʻindidan sonni ayirish qonuni:
(a+b)-c=(a-c)+b
(a+b)-c=a+(b-c)
Misol: (24+9)-14=(24-14)+9=10+9=19.
(2+23)-13=2+(23-13)=2+10=12.
3. Sondan nolni ayirish:
a-0=a
Misol: 6-0=0.
