Massachusetts Department of Elementary and Secondary Education 53 min(s)

In this lesson, children become comfortable with the bundling strategy as not changing the overall quantity. In other words, they understand that it is always possible to count the entire set (or clustering using numbers other than 10, such as 2 or 5), but that using base-ten structures allows the quantity to be known much more efficiently, because the number of tens corresponds to the digit in the tens place of the numeral, and the number of leftover units corresponds to the digit in the units place of the numeral. As you plan, consider the variability of learners in your class and make adaptations as necessary.