2nd Grade Math Patterns Worksheets & Printables - TeacherVision Give students practice with mental math in this counting worksheet. Students find the pattern and count up or down by 3s, 4s, or 5s to complete each number sequence. Counting by 3s, 4s, and 5s II Practice counting forward or backward by 3s, 4s, and 5s with this math worksheet. Students add or subtract 3, 4, or 5 to get to the next number.