The other day I wrote a check and on the line that you write the amount in words I put how many dollars and wrote right next to that 50/100 without any line or the word "and". Will this work, because I already gave the check and am freaking out!
In the US, Section 3.114 of the Uniform Commercial Code sets the rules for how any confusion in checks or other business transactions is handled:
“If an instrument contains contradictory terms, typewritten terms prevail over printed terms, handwritten terms prevail over both, and words prevail over numbers.”
If there was any ambiguity in the way you wrote out the amount, the institution will compare the two fields (the written words and the courtesy box (digits)) to see if the ambiguity can be resolved.
The reality is that the busy tellers and ATM operators typically are going to look at the numeric digits first. So even if they happen to notice the traditional "and..." missing, it seems highly unlikely that such an omission would cause enough ambiguity between these the two fields to reject the payment. Common sense dictates here. I wouldn't worry about it.