There are lots of great songs for teaching Makaton signs and numbers together. Here are few to try:
One two, tie my shoe - great for teaching some basic Makaton signs for common objects as well as using lots of number repetition
One, two, three, four five, once I caught a fish alive - this song can be acted out with the addition of a few simple fish props made of cardboard
The ants go marching one by one - this song is fun for teaching as you do a walking or running task such as counting laps around a running track, and for teaching Makaton signs such as 'go, stop, fast, slow'