Introduce your kids to counting with educational DVDs and video games. Then use this worksheet: look at the picture and help them find the groups of ten; trace a line from the groups with 10 blocks to the number 10. This will help them practice and gain a better understanding of counting.
Math has different levels and gets harder as your child progresses. Don't be surprised when they bring home an algebra worksheet! In this one, they will add 1 tens to varying numbers and fill in the total. This builds their understanding of base tens.