Fractions can be added and subtracted only if they are _ fractions.

Hello.

Fractions can be added and subtracted only if they are like fractions.

Example:

We can subtract these fractions because they are like fractions (they have the same denominator)

Another Example:

We can add these fractions because they are like fractions.

Therefore, the answer is "like"

I hope it helps.

Have a nice day.