Mrs. Huang's dog weighed 4 1/2 kg in January and by June had put on 480 g.What was its mass (in kg) in June?

"4 1/2 kg = 4.5 kg = 4,500 g

so 4,500 g + 480 g = 4,980 g

since the answer wants to be in kg, 4,980 g will be converted into kg which will be

4.98 kg"