Students will learn to use bar models to visualize and solve multiplication and division word problems involving whole unknowns, group size unknowns, and number of group unknowns.

A hands-on lesson exploring the relationship between water level and volume, teaching students how to observe, measure, and compare how much liquid a container holds.

Students explore the concept of volume by counting unit cubes and understanding how layers stack to fill 3D spaces. This lesson transitions from single-layer counting to multi-layer calculations.

Students learn the incrementing strategy to add numbers up to 100 by breaking the second addend into tens and ones and 'jumping' along a number line. This visual approach builds mental math fluency and place value understanding.

A lesson on addition within 100 using the incrementing algorithm. Students learn to break down the smaller part into its place values and add them step-by-step to the larger part using a "mountain jumping" visual theme.

A fun, toy-themed lesson introducing second graders to two-step word problems using equal groups and sharing (foundations of multiplication and division). Students will use visual representations to solve problems involving toys in a shop inventory.

A subtraction-focused lesson themed around Boston's major sports teams, covering 3-digit subtraction with regrouping through word problems and the standard algorithm.

Teaches students to represent subtraction of lengths as moves to the left on a number line diagram.

Teaches students to represent addition of lengths as moves to the right on a number line diagram.

Introduces the number line as a tool for representing whole number lengths starting from zero.