Objective: Compare the efficiency of counting by ones and counting by tens.
In Lesson 1, students are presented with a collection of 20 to 40 items. They discuss and decide how to count the items, and then compare the efficiency of counting individual ones with counting tens and ones. Through this exploration, students come to understand the utility of ten as a unit: both as a method for counting, and for efficiently recording a given number (1.NBT.1, 1.NBT.2).
There may be cases when our downloadable resources contain hyperlinks to other websites. These hyperlinks lead to websites published or operated by third parties. UnboundEd and EngageNY are not responsible for the content, availability, or privacy policies of these websites.