This short video and interactive assessment activity is designed to teach fifth graders about adding and subtracting mixed numbers - word problems.

This short video and interactive assessment activity is designed to teach third graders an overview of area of squares and rectangles - word problems.

This short video and interactive assessment activity is designed to teach second graders about comparing capacity with pictures (english units).

This short video and interactive assessment activity is designed to give fourth graders an overview of forming figures with cutouts.

This short video and interactive assessment activity is designed to give fourth graders an overview of compound unit capacity (metric units).

This short video and interactive assessment activity is designed to teach fourth graders about using symbol maps with compound units.

This short video and interactive assessment activity is designed to give fourth graders an overview of length (english units).

Ck-12's Grade 2 Elementary Math is a series of videos and interactive videos designed to teach basic math concepts to 2nd graders. Concepts covered include Addition and Subtraction, Multiplication, Place Value, Decimals, Time, Fractions, Money, Measurement, and Geometry.

CK-12's Elementary Math Grade 3 is a series of videos and interactive videos designed to teach basic math concepts to 3rd graders. Concepts covered include Addition and Subtraction, Multiplication, Division, Place Value, Decimals, Time, Factors and Multiples, Money, Measurement, and Geometry.

CK-12's Grade 4 Elementary Math is a series of videos and interactive videos designed to teach basic math concepts to 4th graders. Concepts covered include Addition and Subtraction, Multiplication and Division, Multiple Operations and Grouping, Place Value, Decimals, Time, Money, Measurement, and Geometry.

CK-12's Grade 5 Elementary Math is a series of videos and interactive videos designed to teach basic math concepts to 5th graders. Concepts covered include Multiplication and Division, Place Value, Multiple Operations and Grouping, Decimals, Time, Fractions, Money, Measurement, and Geometry.

This short video and interactive assessment activity is designed to teach second graders an overview - equivalent decimals ending in zero.

This short video and interactive assessment activity is designed to give fourth graders an overview of telling time to 1-minute intervals.

This short video and interactive assessment activity is designed to give fourth graders an overview of quarter-circles and semi-circles.