3.NBT.2. Fluently add and subtract within 1000 using strategies and algorithms based on place value, properties of operations, and/or the relationship between addition and subtraction.

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Ages: 8 - 14
Diffy - Virtual Manipulative
From usu.edu, produced by Utah State University
When Diffy opens, there are four black numbers placed at the corners of a black square. Your first goal is to fill in the four blanks in the blue circles in the middle of each side of the black square. Start with any side of the black square and cli... [more]
May 9, 2010 at 11:11 AM
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Not Right For WatchKnowLearn
Ages: 7 - 9
Using Key Words to Solve Math Word Problems
From nextvista.org, produced by nextvista.org
This teacher-created video shows students how to identify key words in word problems which will tell them whether to add or subtract to solve the problem. " In all" means to add;" have left "means to subtract.  Sample problems are written on chart pa... [more]
September 8, 2011 at 06:57 PM
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Not Right For WatchKnowLearn
Ages: 6 - 9
More About Place Value With Tens and Ones
From eduplace.com, produced by Houghton Mifflin
Students will learn how to find the value of a digit by determining its place value.  User clicks through the two slides.
Found by tinag1974 in 3.NBT.A.2
May 20, 2010 at 02:23 PM
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Not Right For WatchKnowLearn
Ages: 6 - 10
Adding/Subtracting/Solving Word Problems with Money Amounts with Decimals
From discoveryeducation.com, produced by Discovery Education
In this computer animated video, students are shown how to read money amounts with decimals.  Next, they are shown step-by-step how to add with decimals.  Then, they are shown strategies for solving word problems using addition or subtraction.
Found by Anonymous in 3.NBT.A.2
November 28, 2010 at 06:50 PM
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Not Right For WatchKnowLearn
Ages: 7 - 12
Estimating Sums and Differences - by StudyJams
From scholastic.com, produced by Scholastic
For estimating sums and differences of whole numbers, try out these two strategies:  rounding and front-end estimation.  Learn more about estimation with this step-by-step, interactive video from StudyJams.  A short, self-checking quiz is also includ... [more]
Found by begamatt in 3.NBT.A.2
June 10, 2011 at 05:40 PM
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Not Right For WatchKnowLearn
Ages: 5 - 10
Chip Abacus
From usu.edu, produced by Utah State University
With this manipulative, you can represent place value and exchanges in base 2, base 5, or base 10. Set the desired base with the up and down arrow buttons below the workspace. Chips in columns then represent units (1), bases (2, 5, or 10), and base-s... [more]
May 9, 2010 at 10:40 AM
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Not Right For WatchKnowLearn
Ages: 4 - 10
Virtual Abacus
From usu.edu, produced by nvlm.edu
This virtual manipulative abacus allows children to explore other representations of numbers.  (It uses a Java applet).
May 9, 2010 at 09:54 AM
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Not Right For WatchKnowLearn
Ages: 7 - 11
Number Pyramid: An Interactive Addition/Subtraction Game
From bbc.co.uk, produced by BBC.Com
In this interactive game, students are shown addition/subtraction problems with missing numbers.  They are shown three choices of numbers to use to complete each problem.  The game contains three levels, with numbers ranging from one to three digits.... [more]
July 14, 2012 at 09:46 AM
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Not Right For WatchKnowLearn
Ages: 7 - 12
Adding Two-Digit Numbers
From YouTube, produced by goldstudent.com
This video provides a brief demonstration of how to add two-digit numbers, using 12+19 as an example. (00:55)
Found by Anonymous in 3.NBT.A.2
March 25, 2009 at 12:09 PM
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Not Right For WatchKnowLearn
Ages: 6 - 10
Teacher Tipster-Place Value Game-(Ones, tens, hundreds)
From YouTube, produced by YouTube
Here's a fun game to help teach place value (ones, tens AND hundreds). You will need a 3 compartment dip tray and matching colored dice. Students play against each other. This is a great opportunity to review place value and even greater than/less th... [more]
Found by porter1526 in 3.NBT.A.2
August 31, 2011 at 09:37 PM
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