CK-12 Foundation
Ck 12: Arithmetic: Whole Number Addition
[Free Registration/Login may be required to access all resource tools.] Write and solve vertical addition problems with whole numbers.
Lawrence Hall of Science
The Math Page: Skill in Arithmetic: Add Whole Numbers, Add Decimals
This website explains and defines adding whole numbers and decimals. Content explores addition with regrouping and how to align numbers in a written calculation. There are even practice problems at the end of the lesson.
Khan Academy
Khan Academy: Round Whole Numbers
Practice rounding whole numbers to the nearest hundred or thousand. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video or receive hints.
CK-12 Foundation
Ck 12: Arithmetic: Estimation of Whole Number
[Free Registration/Login may be required to access all resource tools.] Round whole numbers in order to estimate sums and differences.
Texas Instruments
Texas Instruments: Addition of Whole Numbers
This StudyCards stack enables students to review basic addition of positive and negative integer numbers. They are tested on their ability to add positive numbers, negative numbers and numbers in parenthesis.
CK-12 Foundation
Ck 12: Arithmetic: Estimation of Whole Number
[Free Registration/Login may be required to access all resource tools.] Round whole numbers in order to estimate sums and differences.
Louisiana Department of Education
Louisiana Doe: Louisiana Believes: Eureka Math Parent Guide: Multi Digit Whole Number and Decimal Fraction Operations
A guide to support parents as they work with their students with multi-digit whole number and decimal fraction operations.
Better Lesson
Better Lesson: Domino Addition: Understanding the Part/part/whole Relationship
The big idea of this lesson is the understanding that addition can be represented as parts of a whole and that we can use addition sentences to represent those parts.
CK-12 Foundation
Ck 12: Elem Math: Sums of Whole Numbers to 1000 (Grade 4)
[Free Registration/Login may be required to access all resource tools.] Use addition to find the sum or summand of numbers up to 1000. It includes how to videos with an overview, selecting the correct and incorrect sentence, and adding...
CK-12 Foundation
Ck 12: Elem Math: Sums of Whole Numbers to 1000 (Grade 3)
[Free Registration/Login may be required to access all resource tools.] This site offers the video "Addition: 3 Digits." and a practice quiz in which students solve problems using addition to find the sum or summand of numbers up to 1000.
The Math League
The Math League: Decimals, Whole Numbers and Exponents
This tutorial has definitions and examples of decimals, whole numbers, and exponents. In addition, a variety of topics are covered, such as comparing, multiplying and subtracting.
The Math League
The Math League: Whole Numbers & Basic Properties
Here is a nice resource for students and teachers about whole numbers and their basic properties. It provides links to information on place value, expanded form, and rounding numbers are just a few of the topics on this page.
Fun Brain
Fun Brain: Soccer Shootout (Fractions and Whole Numbers)
Using fractions and whole numbers, score goals and block your opponent's goals by correctly answering addition, subtraction, multiplication, and division problems. Four levels of play--easy, medium, hard, and super brain--to test your...
Better Lesson
Better Lesson: Addition in the Real World
Think of addition in the real world as the joining of two parts to make a whole. The use of addition number sentences can show how we join the parts to make the whole.
CK-12 Foundation
Ck 12: Arithmetic: Whole Number Exponents Grade 6
[Free Registration/Login may be required to access all resource tools.] Understand and solve problems with exponents. In addition, links above this content lead to extended explanations, videos, and practice using exponents.
Other
Kinder Magic: Addition of Whole Numbers
This interactive site contains problems on which you can test yourself and imrpove your skills regarding the addition of whole numbers. Requires Java Plug-in.
Discovery Education
Discovery Education: Web Math: See How Two Numbers Add Together
WebMath offers a good addition practice site. Students can use this site to check their homework assignment. An explanation is given regarding how each answer was arrived at.
Other
Nearpod: Adding Integers: Visual Approaches
In this lesson, students learn several methods to adding integers, including visual approaches and the standard algorithm.
E-learning for Kids
E Learning for Kids: Math: Ice Cream Shop: Numbers to 999
On this interactive site students learn to read two and three digit numbers, use words to write numbers, put numbers in ascending and descending order and locate place value of digits.
Other
Nearpod: Addition & Subtraction: Winter Edition
In this lesson, 2nd graders will use keywords and the part-part-whole model to solve addition and subtraction word problems with 2-digit and 3-digit numbers.
AAA Math
Aaa Math: Adding Five Digit Numbers
AAAMath.com provides an online game to practice addition with five digit numbers. The game will give you addition problems and keep track of your correct and incorrect answers. It will also give you a percent score for the correct answers!
Khan Academy
Khan Academy: Multi Digit Addition
Add whole numbers with sums less than 1,000,000. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video or receive hints.
CK-12 Foundation
Ck 12: Elem Math: Comparing Sums or Differences Between Numbers
[Free Registration/Login may be required to access all resource tools.] Students practice with addition and subtraction of whole numbers.
Utah State University
Teacher Link Printable Teacher Aids
A huge collection of worksheets for addition, subtraction, multiplication, division, and handwriting practice all on PDF files ready for you to download and print for your students.