Add within 100, including adding a two-digit number and a one-digit number, and adding a two-digit number and a multiple of 10, using concrete models or drawings and strategies based on place value, properties of operations, and/or the relationship between addition and subtraction; relate the strategy to a written method and explain the reasoning used. Understand that in adding two-digit numbers, one adds tens and tens, ones and ones; and sometimes it is necessary to compose a ten.

There are 42 videos in this category and 0 videos in 0 subcategories.

Sometimes when you add, you have to regroup, or carry, a group of tens. That is why you need to line up your math problems like a pro. Learn more about addition and regrouping with this step-by-step, interactive link from StudyJams. A short, self-...checking quiz is also included.[more]

To find the difference between two numbers, sometimes you have to regroup, or borrow, from another number. Learn how to subtract using regrouping with this step-by-step, interactive video from StudyJams. A short, self-checking quiz is also included... with this link.[more]

Using two numbers, students will compare the numbers to determine if it is less than or great than. Remember, the greater than/less than symbol points to the smaller number. User clicks through the slides.

In this video, the instructor uses the Paint Program to review how to add numbers. He starts with single-digit numbers, moves into two-digit and four-digit numbers, and reviews place value. (08:57)

With the help of a ten frame and a 10 train, students will learn how to represent 2-digit numbers. The tens frame and train teach students to count the tens and use 10s as benchmark numbers. This is also interactive; you must click on the arrows on... the right side when you are ready to move forward.[more]

In this video, the instructor uses a graphics program to review how to subtract numbers and introduces how to re-group or borrow. The instructor also uses a number line. The video is suitable for elementary students. (18:26)

From discoveryeducation.com, produced by Discovery Education

In this computer-animated video, students are taught to add two digit numbers using regrouping. Students are also shown a strategy for adding two-digit and one-digit numbers using mental math. (03:23)

Students will learn to use addition (the opposite of subtraction) to check the difference. If the sum of the addition problem equals the number you subtracted from, then the answer is correct. User clicks through the slides. Uses metacognitive stra...tegies.[more]

This video teaches students to add two-digit numbers using mental math and left to right addition ( two column addition). The problems appear on a white screen and are explained step-by-step by a math tutor. By the end of the video, students learn t...o add four two-digit numbers. (09:39)[more]

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