If you're seeing this message, it means we're having trouble loading external resources on our website.

If you're behind a web filter, please make sure that the domains *.kastatic.org and *.kasandbox.org are unblocked.

Main content

1st grade

Place value

Numbers 0 to 120: Place valueOnes and tens: Place valueComparing 2-digit numbers: Place value

Addition and subtraction

Relate addition and subtraction: Addition and subtractionAddition within 20: Addition and subtractionSubtraction within 20: Addition and subtractionEqual sign: Addition and subtraction
Missing number within 20: Addition and subtractionWord problems within 20: Addition and subtractionWord problems with "more" and "fewer": Addition and subtractionAdding 1s and 10s: Addition and subtractionIntro to addition with 2-digit numbers: Addition and subtraction

Measurement, data, and geometry

Length and size: Measurement, data, and geometryBar graphs: Measurement, data, and geometryTime: Measurement, data, and geometry
Shapes: Measurement, data, and geometryFractions of shapes: Measurement, data, and geometry

Course challenge

Test your knowledge of the skills in this course. Have a test coming up? The Course challenge can help you understand what you need to review.
Community questions