The kids will love this colorful math work for number recognition. The Elementary Math Maniac: Quick and Fun Math Practice for Little Kids. Another cute way to show number recolonization and one to one correspondence.
Counting and Measuring with Lego: Preschool Maths Game - Good way to visually compare numbers - I would suggest making the corresponding numbers (like 5 and 15 or 8 and 18) the same color to help see the pattern relationship between the numbers (5 and 15 or 8 and 18 are separated by 10)
Learn to Write Numbers Printable Poem - Edsnapshots
Preschool math - counting around the house. We used to do this as kids and always had a blast! Count the number of doors, windows, doorknobs, faucets, etc. This can also segue into making a "map" (floorplan) of the house with all the items pinpointed.