The Odd Numbers Under 20: 1, 3, 5, 7, 9, 11, 13, 15, 17, 19
1, 3, 5, 7, 9, __, 13, 15, 17, 19
NOTE: In the next applet students will identify the missing odd number. Practice several of these problems with the student and write a few sequences on a piece of paper and ask the student what number is missing.