3km+4hm=.....dam

1) 3km --> 300 dam 4hm --> 40 dam 3km + 4 hm=300dam+40dam=340dam 2) 3000m --> 30hm 3700m --> 37hm 3000m+3700m=30hm+37hm=67hm 3) 2,5km= 2500m 4hm= 400m ____________+ 2900m 4) 52m --> 520dm 23dam --> 2300dm 52m+23dam=520dm+2300dm=2820dm