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# 3rd grade

Looking for Missions? Click here to start or continue working on the 3rd grade Mission.

## We’ve updated this course!

We’ve recently made improvements to 3rd grade math! We’ve improved the scope and the structure to be better aligned to the spirit of the Common Core, and we've added content to cover more subjects! You are viewing the newer edition. Learn more or access older edition.

Rounding to nearest 10 or 100: Addition, subtraction, and estimationEstimate to add multi-digit numbers: Addition, subtraction, and estimationStrategies for adding two and three-digit numbers: Addition, subtraction, and estimationAdding with regrouping within 1000: Addition, subtraction, and estimation

Estimate to subtract multi-digit numbers: Addition, subtraction, and estimationStrategies for subtracting two and three-digit numbers: Addition, subtraction, and estimationSubtracting with regrouping within 1000: Addition, subtraction, and estimationAddition and subtraction missing value problems: Addition, subtraction, and estimationAddition and subtraction word problems: Addition, subtraction, and estimation