Our Tens from 10 to 90 lesson plan teaches students strategies for counting in increments of 10 from 10 to 90. During this lesson, students are asked to use items to help visualize what groups of ten look like and practice adding these groups together. Students are also asked to demonstrate their understanding of the lesson material by answering practice questions and matching the number with the proper word expression (20 and two tens, for example).
At the end of the lesson, students will be able to understand that the quantity of tens from 10 – 90 represent groups of tens and zero ones.
Common Core State Standards: CCSS.Math.Content.1.NBT.B.2.C