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.
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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.


(5 minutes)
Numbers: Expanded FormQuincy's Place Value
  • 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.