This Problem Set is a part of the Lesson 9, Unit 6, Grade 1. In this lesson, students count groups of objects in the range of 90-120, record the number of tens and ones involved, and represent the number of objects with a written numeral. (For example, students count 115 linking cubes, notice that there are 11 tens and 5 ones involved, and record the number of linking cubes as "115".)