Question

Calculeaza rapid, folosind propietatea de asociavietate a adunari, dupa model. Ex: 72+28=70+2+28=70+(2+28) =79+30=100
a) 334+66
b) 127+273
c) 993+2107
d) 4675+1325
e) 35275+24725

Answer 1

a) 334+66 = 333+66+1 = 399+1 = 400

b) 127+273 = 127+3+270=130+270 = 370+30 = 400

c) 993+2107 = 993+7+2100 = 1000+2100 = 3000

d)4672+1325 = 4000+1000+600+300+70+20+2+5 = 5000+900+90+7 = 5997

e)35275+24725 = 35000+24000+270+720+5+5 = 59000+990+10 = 59990+10 = 60000