MA 04.NF.B.3d Solve word problems involving addition and subtraction of fractions referring to the same whole and having like denominators,

Solve word problems involving addition and subtraction of fractions referring to the same whole and having like denominators, e.g., by using visual fraction models and equations to represent the problem.

Good Projects here: https://www.illustrativemathematics.org/content-standards/4

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