a vet measured the mass of two birds. the mass of the robin was 76.64 grams. the mass of the blue jay was 81.54 grams. ESTIMATE THE DIFFERENCE IN THE MASSES OF THE BIRD
76.64 rounds to 77, and 81.54 rounds to 82, 82 subtracted by 77 is 4 , 4 is the estimated amount. ( Since I'm only in 5th grade don't write my answer just yet, wait until someone else answers the problem ) ;)
