The big idea of this lesson is that three (or more) numbers can be grouped together and added. The order of this grouping doesn't matter.

Second graders should be able to recognize what makes one number greater or smaller than another, using place value understanding which is crucial to Common Core mastery. This lesson combines math and science by having students order...

It's time for lunch! In this week-long adventure, children will explore numbers and counting in the context of healthy eating. They will learn about the five food groups and create a healthy lunch using foods from each food group. Each...

The Common Core standard is that students understand that the numbers 100, 200, etc. represent so many groups of 100.

Introducing a card game that your students can play in small groups to develop their addition skills. This video focuses on addition of positive and negative numbers and briefly touches on subtraction of integers.

Students will explore matter that sinks or floats when submerged in water and that matter is categorized as either a sinker or a floater. Students will work actively in small, cooperative learning groups as well as gather in a whole...