This Problem Set is a part of the Lesson 14, Unit 1, Grade 1. In this lesson, students count on to find the total in an addition situation. For example, when looking at a group of 4 crayons and another group of 2 crayons, they count on from 4 ("Four...five, six!") to find the total and write the equation 4 + 2 = 6 to represent the situation.