Skip Counting songs can be a big help!  Try to sing to these:

2's Yankee Doodle

3's Are You Sleeping

4's Row Row Row Your Boat

6's London Bridge

7's Mary Had a Little Lamb

8's This Old Man

 

www.coolmath4kids.com/

www.funbrain.com/math/

www.aplusmath.com/Flashcards/index.html

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