Lesson Plan

Let's Stretch the Values! Writing Two-Digit Numbers in Expanded Form

What does it mean to expand a number? Use this lesson plan to help your students understand how to write the expanded form of two-digit numbers.

Grade:

First Grade

View aligned standards

1.NBT.B.2.a

1.NBT.B.2.b

1.NBT.B.2.c

Let’s stretch the values! Young mathematicians learn about writing two-digit numbers in expanded form in this helpful math lesson plan. Designed for first graders, this lesson introduces learners to place value by breaking down two-digit numbers into tens and ones (e.g., the number 25 can be understood as 20 and 5). Children will review terms such as single-digit numbers, value, and expanded form, and then practice writing two-digit numbers on charts and in number sentences to help them visualize the different values.

Learning Objectives

Students will be able to identify the digit in the ones and tens places of a two-digit number.
Students will be able to construct a number when told the digits in the tens place and ones place.
Students will be able to write a two-digit number in expanded form.

Introduction

(5 minutes)

Remind students what they already know about single-digit numbers, or the numbers 0 through 9.
Tell students that today they are going to learn about two-digit numbers and their values.
Remind students that value means how much a number is worth. Tell your students that they can show value using counters, manipulatives, and base ten blocks.
Explain to your students that they will learn about place value, or the value of the location of a digit in a number.