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Number facts are related, just like families! Help students learn all about fact families while they make fact family trees!

Make a math mystery! In this lesson, help your students understand the relationship between addition and subtraction and how a missing addend word problem is represented with a number sentence.

In this lesson, students will learn how to add a one-digit number to a two-digit number. This will help students build upon the skills needed for regrouping larger numbers.

Students sketch base-ten blocks in this lesson that builds both number sense and fluency adding to 20!

It's time-telling time with this fun lesson featuring Trudy Harris' 'The Clock Struck One.' Students will learning about time with a short story and hands-on practice with analog clocks.

Get your students excited about adding by introducing them to word problems with three addends!

This lesson will make solving subtraction word problems fun for students. It includes music and interaction to grab your students' attention.

Let’s start building numbers! Just as building skyscrapers is a visual representation of mathematics, students will use the visual representation of base-ten blocks to add—or build—onto a two-digit number.