Not only are vertical number lines recommended for use with Common Core, but they are a much more realistic tool to use with integers. Think about it, elevation, altitude, temperature...they are all vertical, not horizontal. So, swing over and pick it up while it is still free. Or you could wait for the BIG TPT SALE coming up on Monday and Tuesday! In any case, please leave a little love on your way out:)
Have a great Thanksgiving!