One More within 20: Horizontal Addition Worksheet

Students understand that more than indicates addition. So they add the extra to the given number. They may count on from the given number to get to the result. In one more within 20 worksheet, students get plenty of practice with this concept. This worksheet is about practicing with the horizontal format in which numbers are written side by side. To develop flexibility with numbers and operations, students need to have enough practice in this format and not just rely on the vertical/column method.