Use this lesson to introduce composing and decomposing as part of your students’ addition and subtraction toolkits.

Support your students' understanding of word problems as they invent strategies to add three addends in any order. Use this scaffolded EL lesson plan alone or with How'd You Get that Many?

Ready, set, fractions! In this hands-on lesson, your students will familiarize themselves with common fractions using concrete materials to practice splitting items into halves, thirds, and quarters.

Teach your students to calculate fractions of 100 using a number line model.

Let your students show off what they've learned about time, money, and temperature with this lesson that combines all three in one word story.

Help your students see the variety of strategies they can use to compare fractions! Students will compare their strategies with that of their classmates. Use this lesson on its own or use it as support for the lesson Fraction Wars.

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

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

Teach your students to find the perimeter of polygons using real world examples. They will make polygon pictures using tangrams and practice finding the perimeters of the polygons in their masterpieces.