Skip Counting Songs (Tracks 3, 6, 9, 13, 16, 19)
First let me clarify the reasoning behind only doing some of the multiples. (I'm sure if you teach 3rd, 4th, or 5th grade you've already figured it out). I don't have songs for the multiples that kids easily remember. The purpose of Singin' the Standards is to provide students with mnemonic devices to help them remember things they EASILY forget. Not many kids forget their 2's, 5's or 10's.
Skip counting is the foundation for repeated addition/multiplication. For those students who have trouble memorizing times tables, and/or for those students just learning times tables, skip counting acts as a feasible means to find answers to multiplication problems. I teach my students to use their mouth for the bigger number and their fingers for the smaller number. For example, for the problem 5 X 7, students would count aloud by 7's (the larger number) and use their fingers to show 1 at a time up to 5 (the smaller number.) In other words, students would sing, "7, 14, 21, 28, and 35," as they count up on their fingers to five. This method is the shortest trip to the answer. If they were to count by 5's with their mouth while raising 7 fingers, the students need to count two extra numbers to arrive at the correct answer. If you don't understand my point, don't worry about it; the songs still work great and the kids love them.