Khan Academy
Khan Academy: Math: 3rd Grade: Understand Multiplication Using Groups of Objects
Math practice exercise on using arrays and repeated addition to visualize multiplication.
Khan Academy
Khan Academy: Add Using Groups of 10 and 100
Practice making groups of 10 and 100 while adding 3-digit numbers.
![Arts Now Learning: Addition Race [Pdf] Lesson Plan](https://d15y2dacu3jp90.cloudfront.net/images/attachment_defaults/resource/large/FPO-knovation.png "Arts Now Learning: Addition Race [Pdf] Lesson Plan")
ArtsNow
Arts Now Learning: Addition Race [Pdf]
For this lesson, 2nd graders will complete math problems with groups to reinforce the concept of completing addition using regrouping.
Khan Academy
Khan Academy: Adding 53+17 by Making a Group of 10
Sal adds 53+17 by breaking apart the numbers and making a group of 10. [3:35]
Math Is Fun
Math Is Fun: Word Questions: Elementary Addition
Work against a timer as you test your ability to add and to solve word problems. Use number-line clue for help and score points. Fun activity for individuals, small groups, on an entire class.
Illustrative Mathematics
Illustrative Mathematics: Using Operations and Parentheses
The purpose of this task is to give students a chance to work creatively with three of the four fundamental arithmetic operations (addition, subtraction, and multiplication). It is well suited for helping students develop fluency with...
E-learning for Kids
E Learning for Kids: Math: Group of Pyramids: Multiplication: Skip Counting and Number Line
On this interactive site students practice with basic multiplication skills including counting forward by two's, skip counting to find the total number, and using a number line to solve multiplication problems.
ClassFlow
Class Flow: Shedding Some Light on Properties of Addition
[Free Registration/Login Required] This flipchart explores the properties of addition: order property, zero property, and the grouping property. It also uses manipulatives to show and practice each property.
NumberNut
Number Nut: Shapes, Symbols, and Colors: Grouping
Find out how grouping is used in addition, multiplication and division. Then practice set recognition playing the two interactive games.
PBS
Pbs Learning Media: Fresh Pick Challenge: Logical Lunch
By using their deductive reasoning skills, children can help Henry and Avril pack a perfect picnic lunch. This activity will provide them with ways to use clues to solve a problem, group objects based on several attributes, and...
NumberNut
Number Nut: More Than Two Addends
Develop strategies for adding more than two addends with this quick addition lesson. Examine how grouping numbers can help make adding multiple numbers easier. Then, practice your new skills using the related interactive games that are...
National Council of Teachers of Mathematics
The Math Forum: Ask Dr. Math: Distributive Property Illustrated
This is part of a math forum at Drexel University. A student gets frustrated when asked to solve a problem using the distributive property. Never fear. Dr. Math to the rescue! Illustrations and detailed examples help provide...
Alabama Learning Exchange
Alex: Carlos the Centipede Is Adding Decimals!
In this lesson, students will work in collaborative/cooperative groups to understand adding decimals. Students will use decimal grids to represent the sum of decimals. Emphasis is on using place-value, lining up the decimals and bringing...
Sophia Learning
Sophia: Adding Words to Quotations
A seven-slide presentation explaining how to make minor additions or changes to a quotation in order to make it fit properly into a new text. Examples are provided.
Alabama Learning Exchange
Alex: Partying With Two/three Digit Whole Numbers
The purpose of this lesson is to apply the operations of addition to solve problems using multiple strategies. The students will communicate their math knowledge during the process by showing examples and discussing their work. This...
ClassFlow
Class Flow: Adding/ Subtracting Strategies
[Free Registration/Login Required] This flipchart is geared for grade 1. Created in Activprimary, it enforces the variety of adding and subtracting strategies. use as a center or for whole group instruction.