Question

When Emma was born, she weighed 3.2 kilograms. In 2 months, she weighed
5.15 kilograms.



How much did Emma gain in her first 2 months?

Answer 1

final weight minus initial weight will give you the difference (ie weight gain)

Answer 2

So to make it slightly easier to understand just do this
5.15
- 3.12
= your answer