Question

Calculează rapid, folosind proprietatea de asociativitate a adunării, după model. Exemplu: 72 + 28 = 70 + 2 + 28 = 70 + (2 + 28) = 70 + 30 = 100. a) 334 + 66; b) 127 + 273; c) 993 + 2 107; d) 4 675 + 1 325; e) 35 275 + 24 725

Answer 1

a. 334+66=334+60+6=(334+6)+60=340+60=400
b.127+273=127+270+3=(127+3)+270=130+270=400
c.993+2107=993+2100+7=(993+7)+2100=1000+2100=3100
d.4675+1325=4675+1300+25=(4675+25)+1300=4700+1300=6000
e.35275+24725=35275+24000+725=(35275+725)+24000=36000+24000=60000