In previous lessons, students read two-digit numbers. Students also interpreted and created representations of two-digit numbers. In this lesson, students write two-digit numbers to match different base-ten representations. Students also learn a new center that provides practice counting and writing numbers up to 99.

Reflect on how you can reinforce number writing outside of math class. When can you ask students to write 2-digit numbers that represent quantities around them? What questions can you ask to help them see the tens and ones in these quantities?