1 and 2 more within 20 worksheet helps students develop proficiency with addition. Students are aware that more than means to add. So they use the count on strategy to get to the result. 1 And 2 more within 20 worksheet provides students with a tonne of experience with this concept. This worksheet is about practicing the column method in which numbers are written one on top of another. In this method, students use their place value understanding to solve the problems.