I just cut them and laminated them. They worked really well, and not only for more/less but also for helping the kids understand which way you go on a number line when you're talking about a number that's less than or greater than a given number.
I made a worksheet to go with it, for independent practice and for assessment purposes:
Later this week, I'm going to have the kids read this book, which takes them step-by-step through the process of making a Valentine's Day card:
I also have a Valentine's Writing Folder on TPT. I think this folder is really sweet because it saves me from having to spell Valentine words many times around the classroom, and it helps the students to be self-reliant.
I hope you have a lovely week!