Question

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 birds.

Answer 1

76.64------77
81.54------82
82-77=5 grams

Answer 2

The difference would be about 5 grams. I subtracted the difference between the blue jay and the robin and i got 4.9, and that rounds to 5 grams