1. Quyidagilarni hisoblang: a) −13 + 5; b) (−27) + (−3); d) (−4) + 18; e) 18 + (−7); f) 0 + (−12); g) −37 + 37; h) −16 + (−25); i) 24 + (−30).

Musbat va manfiy sonlarni qo‘shishda ularning modullarini ayiramiz va kattaroq modulning ishorasini saqlaymiz; bir xil ishorali sonlarni qo‘shganda modullarini qo‘shamiz.

a) −13 + 5 = −8; b) (−27) + (−3) = −30; d) (−4) + 18 = 14; e) 18 + (−7) = 11; f) 0 + (−12) = −12; g) −37 + 37 = 0; h) −16 + (−25) = −41; i) 24 + (−30) = −6.