Students gain experience and practice with three types of word problems using the "Take From" context: result unknown, change unknown, and start unknown.

This is a rectangle subdivision task; ideally instead of counting each square. students should break the letters into rectangles, multiply to find the areas, and add up the areas. However, students should not be discouraged from using individual counting to start if they are stuck. Often students will get tired of counting and devise the shortcut method themselves.

Download these free worksheets to sharpen your math skills. These St. Patrick's Day math worksheets focus on topics such as patterning, comparing numbers, counting, word problems, addition, multiplication, and mixed operations.

Sal goes through multiple strategies for adding 2-digit numbers. [3:15]

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

This short video and interactive assessment activity is designed to teach second graders about subtracting 3 numbers - word problems.

This short video and interactive assessment activity is designed to teach second graders about subtracting one-digit numbers - word problems.

This short video and interactive assessment activity is designed to teach second graders an overview of subtraction (numbers up to 20).

This short video and interactive assessment activity is designed to teach third graders about subtraction: completing the subtraction sentence.

This short video and interactive assessment activity is designed to teach fourth graders about subtraction: completing the subtraction sentence.

This short video and interactive assessment activity is designed to teach second graders an overview of subtraction (numbers up to 10).

This short video and interactive assessment activity is designed to teach second graders about subtracting by counting backward with pictures.

This short video and interactive assessment activity is designed to give fourth graders an overview of addition (sums to 1,000).

This short video and interactive assessment activity is designed to teach second graders an overview of addition (sums to 1,000).

This short video and interactive assessment activity is designed to teach third graders an overview of addition (sums to 1,000).

Create your own addition/subtraction math facts worksheets. Use them in the classroom for practice or timed drills, or at home! Choose from two levels of difficulty, and vertical or horizontal equation format. You input minimum and maximum values of the numbers to be used, as well as how many questions you'd like, and the site does the rest!

The goal of this task is to help students understand the commutative property of addition by examining the addition facts for single digit numbers. This is important as it gives students a chance, at a young age, to do more than memorize these arithmetic facts which they will use throughout their education.

On this site from Aussie School House Teachers on the Web, an Australian K-6 teacher defines and illustrates more than 500 mathematical terms. It is a wonderful dictionary featuring clear and often interactive graphics, great colors, and lots of examples. It has been recently updated adding more terms, charts, and an app.

Download these free worksheets to sharpen your math skills. These Thanksgiving math worksheets focus on topics including comparing, patterning, addition, subtraction, multiplication, and division.

This instructional task requires students to add four numbers to find the solution.