Adding a 2-digit and 1-digit number using tens and ones counters to compose groups of 10

In this lesson, students will use what they know about place value to add a two-digit number and a 1 digit number by composing groups of tens with tens and ones counters and a tens/ones chart. Since the tens/ones chart and counters were mentioned at the beginning of the introduction, students should be able to determine the concrete model with ease. Teacher asks students to predict what the concrete models for this lesson will be.