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Curated Video
Building Fact Families with Addition and Subtraction
In this lesson we explore fact families: three numbers that make addition and subtraction sentences together. Learning fact families helps students relate addition and subtraction, solve for unknowns, and identify missing addends. I'd...
Math Mammoth
Math Mammoth: Subtraction and Addition in the Same Picture
This video demonstrates how addition and subtraction are related when looking at the same set of objects and models how to solve several problems. [8:13]
PBS
Pbs: Odd Squad: How to Feed the Hamster
Oscar needs to calculate the value of an unknown number in a subtraction formula in order to feed the Odd Squad hamster.
PBS
Pbs: Odd Squad: It's Picture Day!
It's Picture Day at Odd Squad, and Otto needs to use an equation to calculate how long he needs to wait in line.