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Khan Academy

Khan Academy: Add/ Subtract Mixed Numbers W Unlike Denominators (No Regrouping)

For Students 5th
Practice adding and subtracting mixed numbers with different denominators. No regrouping required.
Activity
NumberNut

Number Nut: Addition: 3 Digit Numbers

For Students 3rd - 8th
Three digit addition requires working from left to right and may require carrying. Follow the steps in the examples and then practice the skills with the two interactive activities.
Whiteboard
ClassFlow

Class Flow: To Regroup or Not to Regroup, That Is the Question

For Teachers Pre-K - 1st Standards
[Free Registration/Login Required] Given base ten blocks and 5 addition problems, the students will demonstrate understanding of the base ten system by choosing to regroup when needed 100 % of the time, with or without visual...
Activity
NumberNut

Number Nut: Addition: Carrying

For Students 3rd - 5th
Explains how to carry when regrouping in addition, with related activities for skill practice.
Interactive
AAA Math

Aaa Math: Vertical Addition

For Students 1st - 5th
See examples of addition problems that are arranged vertically. There is also a game that allows you to practice your addition skills. The game keeps track of your correct and incorrect answers, it also gives a percentage score of your...
Interactive
AAA Math

Aaa Math: Adding Three Digit Numbers

For Students 2nd - 5th Standards
Read through this explanation of how to add three digit numbers. Use the online game to practice this skill. The game will keep running totals of your correct and incorrect answers. It will also show you a percent score of the correct...
Activity
NumberNut

Number Nut: Let Math Begin With Addition

For Students Pre-K - 1st Standards
This introductory addition lesson, explores the relationship between adding and number patterns using a number pyramid designed by mathematician Carl Gauss. A short lesson with interesting facts and links to related games for practicing...
Activity
School Express

School Express: Online Addition

For Students Pre-K - 1st Standards
Great place to sharpen your addition skills. Start with basic facts and go all the way up to 3 digit addition with regrouping. You select the level of difficulty and the number of problems. You can also check your answer right away.
Unit Plan
Khan Academy

Khan Academy: Add 10s and 100s (No Regrouping)

For Students 1st - 3rd
Practice solving problems like 344+20 and 344+200. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video or receive hints.
Unit Plan
Khan Academy

Khan Academy: Add 2 and 3 Digit Numbers (No Regrouping)

For Students 1st - 3rd Standards
Practice solving problems like 243 + 452. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video or receive hints.
Unknown Type
Lawrence Hall of Science

The Math Page: Skill in Arithmetic: Elementary Addition

For Students Pre-K - 1st Standards
This resource offers six brief arithmetic lessons: sums less than ten, sums of ten, and sums between ten and twenty, doubling, zero, and a set of general practice problems.
Unit Plan
Khan Academy

Khan Academy: Add 1s or 10s (No Regrouping)

For Students K - 1st
Practice solving problems like 34+5 and 34+50. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video or receive hints.
Unknown Type
Khan Academy

Khan Academy: Add and Subtract Mixed Numbers (No Regrouping)

For Students 4th Standards
Practice adding and subtracting mixed numbers.
Unit Plan
Cool Math

Coolmath: Coolmath4kids: Adding Numbers Within 1000

For Students 3rd - 4th Standards
Step-by-step tutorial showing how to add 3-digit numbers in place value columns with and without regrouping. CCSS.Math.Content.3.NBT.A.2 Fluently add and subtract within 1000
Interactive
NumberNut

Number Nut: Subtraction: Subtracting From Three Digit Numbers

For Students K - 1st
Explains how to subtract from three-digit numbers, with or without regrouping.
Unit Plan
Lawrence Hall of Science

The Math Page: Skill in Arithmetic: Add Whole Numbers, Add Decimals

For Students 3rd - 8th Standards
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.
Whiteboard
ClassFlow

Class Flow: Two Digit Addition With Regrouping

For Teachers Pre-K - 1st Standards
[Free Registration/Login Required] This flipchart will help the second grade student review three digit place value and comparing numbers. It has a helpful work mat for teaching two digit addition with regrouping. Students will learn how...
Activity
Lizard Point Quizzes

Lizard Point: Addition Practice

For Students Pre-K - 1st Standards
Practice several different levels of difficulty of addition problems from single digit all the way up to 3 digit with regrouping. You can also choose single digit addition with negative numbers. When you are finished you can print your...
Unit Plan
Khan Academy

Khan Academy: Add 2 Digit Numbers (No Regrouping)

For Students K - 1st Standards
Practice solving problems like 24 + 45. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video or receive hints.
Activity
Quia

Quia: Adding to 10

For Students 3rd - 5th Standards
This website for young children gives them practice adding sums to 10. Problems are presented as teddy bears to add up with the corresponding digits that represent the problem symbolically.
Activity
Other

Room 108: Addition With Carrying Over

For Students 3rd - 5th
This website helps you go through the steps to add larger numbers when you need to "carry." There are audio instructions that show you step-by-step how to do the traditional algorithm. Requires Java.
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Khan Academy

Khan Academy: Add and Subtract Mixed Numbers (No Regrouping)

For Students 3rd - 5th Standards
Practice adding and subtracting mixed numbers with common (like) denominators. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video or receive hints.
Website
PBS

Pbs Learning Media: Figuring Out Elapsed Time

For Students 3rd - 8th
In this video segment from Cyberchase, through addition and regrouping in base sixty, Matt helps Digit figure out what time his CyberSouffle will be done.
Activity
Teaching Treasures Publications

Teaching Treasures: Year Three Math (Page 5)

For Students 3rd - 6th Standards
Sharpen your computation skills with two-digit addition, two-digit subtraction, and one-digit multiplication facts using this interactive worksheet. Learners must be familiar with multiplication facts through twelve to be successful....

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