First Grade Common Core Math Worksheets

First Grade Common Core Math Worksheets. Work with addition and subtraction equations. Express the length of an object as a whole number of length units, by laying multiple copies of a shorter object (the length unit) end to end;

Work with addition and subtraction equations. (1) developing understanding of addition, subtraction, and strategies for addition. Express the length of an object as a whole number of length units, by laying multiple copies of a shorter object (the length unit) end to end;