This is an interactive assessment and video designed to teach Adding and Subtracting (Numbers up to 20) - Word Problems to first graders.

This short video and interactive assessment activity is designed to teach first graders about multiple object lengths (english measurement).

This short video and interactive assessment activity is designed to teach first graders about counting rectangles, squares, and triangles in composite figures.

This short video and interactive assessment activity is designed to teach first graders about selecting the correct addition sentence (sums to 100).

This site features a video overview of Addition (Sums to Twenty) for 1st Graders.

This video and accompanying interactive assessment practice was designed to teach completing the subtraction sequence to first graders.

This short video and interactive assessment activity is designed to teach first graders an overview of rectangles, squares, circles and triangles.

This is a video and assessment exercise aimed at helping first graders identify incorrect subtraction.

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

This short video and interactive assessment activity is designed to teach first graders about single object length (english measurent).

This short video and interactive assessment activity is designed to teach first graders about how big is a meter?.

This short video and interactive assessment activity is designed to teach first graders an overview of subtraction (numbers to 100).

This video lecture serves as a review of subtraction up to the number twenty for first graders.

This short video and interactive assessment activity is designed to teach first graders an overview of telling time to quarter and hour.

This is a video and interactive assessment activity designed to help first graders learn about subtraction word problems up to twenty.

This video and accompanying interactive assessment practice was designed to teach Two-step Subtraction (Numbers to 100) - Word Problems to first graders.

This course features a video review and an assessment practice of subtracting by crossing out with pictures for word problems. It is aimed at first grade math students.

This problem helps students practice adding three numbers whose sum are 20 or less.

This problem with multiple solutions offers an opportunity for students to practice simple addition and subtraction, work with number sentences (equations), and develop systematic work habits. Given cards containing the addition, subtraction and equal signs along with the digits 2, 4, 6, and 8. solvers are challenged to find as many ways as possible to arrange some or all seven cards to create true statements. The Teachers' Notes page offers suggestions for implementation, discussion questions, ideas for extension and support, printable cards (pdf) and a link to an interactive Flash applet.

This number challenge is an opportunity to reinforce mental arithmetic and order of operations while developing systematic work habits. Students are asked to use the numbers 4, 6, 6, and 8 (exactly once each) and the four basic operations to find as many ways as they can to represent the number 24. There are over 60 different ways! The Teachers' Notes page includes suggestions for implementation, discussion questions, ideas for support, and a link to a related article, Opening Out. (cataloged separately).