# Building in Base-Ten

Build a solid foundation in number sense with this lesson all about the friendly number 10! Students will count with both fingers and base-ten blocks. This lesson can be used alone or with the lesson plan **Place Value Concentration.**
This lesson can be used as a pre-lesson for the Place Value Concentration lesson plan.
##### View aligned standards
This lesson can be used as a pre-lesson for the Place Value Concentration lesson plan.

#### Objectives

Students will be able to name and compose two-digit numbers with base-ten blocks.

##### Language

Students will be able to describe the value of digits in the tens and ones places, and compose and decompose two-digit numbers with manipulatives, word banks, and partner support.

#### Introduction

(5 minutes)
• Gather students on the rug and ask them to show you a number of fingers less than 10.
• Ask students whether or not it is possible for just one student to show 44 fingers.
• Work together as a class to show 44 fingers. Let students figure out that four students should stand at the front of the class, each showing 10 fingers, with a fifth student showing four fingers.
• Think aloud, "I see four sets of 10 fingers, and four extra fingers. Four sets of 10, plus four, is 44." Point to the raised fingers as you say, "Let's count by tens first. Ten, 20, 30, 40, 41, 42, 43, 44."
• Model showing and counting a few other two-digit numbers as a class.