[tex]\ \ \ _2\\\ \underline{} \ \ \ 25\\\underline{\times\ 50}\\+ \ \ 0\\\underline{1250}\\\boxed{1250}[/tex]
Set up your multiplication like so, with the 25 and 50 lined up.
We focus on the first digit on the bottom number, 0, and multiply this by our first digit on the top number, 5. This leaves us with 0. We write that, then multiply the 0 by the next digit 2, and we still have zero.
Go to the next digit in our bottom number, the 5. Add a zero one line below, then we multiply 5×5 to get 25...put down the 5, carry the 2...5×2 = 10 + the 2 = 12 and we are left with 1250.
Add 0 + 1250 and our answer is 1250.
