This activity helps the child get more confident with numbers. Just like number recognition, Number sequencing is also important. Initially it is not easy for a child to quickly tell what comes before or after. This activity helps the child to get better.
I made those DIY cards (just used A4 sheet, cut them into equal sizes and then wrote the numbers), and some numbers is all that is needed. Super easy to set this up, this activity is one real important activity for kids to work with number sequence.