A Missing Number 1-20 Worksheet is a tool that teachers use to help students in the sixth grade practice counting and identifying numbers in a sequence. The worksheet contains a series of numbers from 1 to 20, but some numbers are missing. The goal is to figure out what those missing numbers are and fill them in the correct spots. By doing this, students get better at understanding numbers and recognizing patterns. It’s a fun way to improve counting skills and problem-solving abilities!