Use this algebra lesson to learn how to factor the sum of two squares.

Play a game with a partner to create number sentences with a sum of ten.

[Free Registration/Login may be required to access all resource tools.] The video uses pictures to determine which set of pictures represents the addition problem 3 + 6 = 9. The video is followed by practice problems.

[Free Registration/Login may be required to access all resource tools.] In this interactive media source, the video shows how to write a number sentence from counting groups of pencils, followed by practice problems to assess understanding.

An engaging interactive math activity where students practice adding two sets of objects with a sum less than or equal to ten.

[Free Registration/Login may be required to access all resource tools.] Recognize the sum of the interior angles of a triangle as 180 degrees.

[Free Registration/Login Required] This flipchart introduces the concept of addition of sums of 10 or more than 10. The flipchart has examples with visuals to help students understand tens and ones. It would be useful when beginning a...

Drop Sum is an 8-bit style math game for kids to practice addition. Drop Sum has 2 modes of play: Make 10 & Random. In Make 10 mode kids must add falling blocks together to equal 10. In Random mode kids must add falling blocks...

[Free Registration/Login may be required to access all resource tools.] The video uses a model to aide in showing how to add numbers up to ten. In addition to the video, there is a PLIX interactive challenge where students answer...

This website from The Math Page explains some helpful hints about how to do mental math.

Students learn how to solve a mathematical equation with a missing addend. Students will learn the combinations of addends to find the sums of nine and ten. Students practice math facts with accuracy and immediacy for sums of nine and ten.

This resource offers six brief arithmetic lessons: sums less than ten, sums of ten, and sums between ten and twenty, doubling, zero, and a set of general practice problems.

[Free Registration/Login Required] In this activity, students use the visual cues from a fact family triangle, manipulatives and numbers to understand and apply the concepts and procedures of mathematics including addition, subtraction,...

[Free Registration/Login may be required to access all resource tools.] Apply the Third Angle Theorem.

Use this online game to practice your 9 and 10 addition facts. A percent score of your correct answers, as well as running totals of correct and incorrect answers are given while you play.

Improve your estimation and rounding skills with these interactive games that are challenging and fun. Excellent skills practice for rounding, estimating sums and differences, and front-end estimation. Links to lesson plans, teacher...

This website for young children gives them practice adding sums from 10 to 18 in a matching type format.

Practice adding 2-digit numbers like 43+27 that have sums that are multiples of 10.

This ten-question, multiple-choice quiz assesses students' knowledge on the concept of exponents. Students evaluate exponential numbers, the sum of exponential numbers, and the difference of exponential numbers. A summary of the results...

Play this game to match two written Italian number words to their sum in Italian. The numbers are multiples of ten, up to one hundred.

Camp Add 'Em Up is a series of lessons for first grade students. Students will use prior knowledge of friendly numbers (two number combinations that make a "10") and "adding on" as they master the ability to add three numbers. In this...

Sharpen your logic and addition skills while working on this challenge. Solution.

On this one page website sharpen your logic and addition skills while working on this challenge. The solution is available to double check your solution.

Use this online game to practice your addition facts through 10+10. The game keeps track of how many answers you have correct and incorrect. It even gives you a percent score of your correct answers.