Students put all of their addition and subtraction skills together to solve equations.

Fifth-graders will continue to deepen their understanding of addition, subtraction, multiplication, and division of fractions.

The new theme is Addition and Subtraction, stories of humans becoming more and less and sometimes both with the help of technology.

Under the common core, there are many ways to do subtraction—none of which involve borrowing and carrying.

Steps in addition and subtraction of four-digit numbers were motivated by the size of the blocks and then were carried out with the blocks; each step was immediately recorded with base-ten numerals.