Compose and decompose numbers from 11 to 19 into ten ones and some further ones, e.g., by using objects or drawings, and record each composition or decomposition by a drawing or equation (such as 18 = 10 + 8); understand that these numbers are composed of ten ones and one, two, three, four, five, six, seven, eight, or nine ones.
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Ages: 7  10
7681 Views:

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 stepbystep, interactive link from StudyJams. A short, self...checking quiz is also included.
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June 18, 2011 at 10:32 PM


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Ages: 7  12
8605 Views:

Inverse operations are pairs of mathematical operations, like addition and subtraction, that can undo eachother. You can learn how to do it by using fact families. This cartoon animation from StudyJams also includes a short, selfchecking quiz.
June 18, 2011 at 10:26 PM


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Ages: 6  12
6409 Views:

Using manipulatives, students learn to regroup, trade or change groups of 1's into 10's. When you have more than 10 ones blocks, regroup, or change, 10 ones to 1 ten. User clicks through the slides.
May 20, 2010 at 02:41 PM


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Ages: 4  7
7542 Views:

Using a tens and ones workmat, students learn how to take a large group of ones and put them into groups of ten regrouping. Take the group of 10 ones and put it in the tens column. User clicks through the slides.
May 14, 2010 at 01:40 PM


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Ages: 7  12
4930 Views:

In this video, the instructor uses the Paint Program to review how to add numbers. He starts with singledigit numbers, moves into twodigit and fourdigit numbers, and reviews place value. (08:57)
January 27, 2010 at 02:32 AM


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Ages: 7  12
5266 Views:

This video teaches students to add twodigit numbers using mental math and left to right addition ( two column addition). The problems appear on a white screen and are explained stepbystep by a math tutor. By the end of the video, students learn t...o add four twodigit numbers. (09:39)
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July 20, 2011 at 10:39 AM


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Ages: 8  14
7976 Views:

Add and subtract decimal values using base blocks. The problems difficulty is controlled by the user. Set the number of whole number columns up to 100s. Set the decimal places from 0 to 3 places. Other bases are available. Please take a few secon...ds to wait for this virtual manipulate (that uses a Java applet) to fully load. From Utah State University.
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May 9, 2010 at 10:16 AM


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Ages: 6  12
4818 Views:

Base Blocks Addition – Use base ten blocks to model grouping in addition. This manipulative uses a Java applet.
May 9, 2010 at 10:13 AM


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Ages: 7  10
2979 Views:

In this video, students review place value up to the hundreds place. Then, they are given a series of numbers and must identify the number of digits and how many are in each column of hundreds, tens, and ones. They also practice writing numbers from ...place value clues. (6:12)
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November 28, 2010 at 06:20 PM


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Ages: 5  8
2859 Views:

Using tens and ones blocks to model the numbers, students will add a 1digit number to a 2digit number. Begin by adding the ones together, then the tens. The user clicks through the slides.
May 20, 2010 at 02:03 PM
