This website has an excellent introduction. http://www.mathsisfun.com/numbers/skip-counting.html It also has practice for students to skip count forward. If skip counting is easy for your child, there is also practice skip counting backwards.
Some great activities to do at home include:
1. Have students color the multiples they are counting by on the hundreds chart. For example, have them select a color and color all the squares that are multiples of two the same color. The chart becomes a great visual for skip counting by 2's, 5's, and 10's.
2. Have students draw out a number line to show what they are counting by.
3. Play some of the excellent games below:
**Excellent game** http://members.learningplanet.com/act/count/free.asp
Several more games can be found near the bottom of this site http://www.aaamath.com/g25f2-countby5.html#section2
4. Go through some of these practice pages:
Great practice pages: http://www.enchantedlearning.com/math/counting/skipcounting/
Remediation skip counting tips: http://www.glc.k12.ga.us/passwd/trc/ttools/attach/parent/10ways/TenWaysSkipCount.doc
Remediation skip counting practice: http://www.justforkidsonly.com/mathskipcounting.htm