This worksheet invites students to add 2-digit numbers and multiples of 10, which helps them become proficient in addition. Adding a number to 0 results in the number itself. Students love to apply this concept when they add numbers ending in zeros. This worksheet strengthens their accuracy with a set of problems on add 2-digit numbers and multiples of 10. 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.