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Khan Academy

Khan Academy: Add & Subtract Mixed Numbers With Unlike Denominators (Regrouping)

For Students 5th
Practice adding and subtracting mixed numbers with different denominators. Regrouping required.
Activity
Lawrence Hall of Science

The Math Page: Skill in Arithmetic: Subtracting Whole Numbers and Decimals

For Students 3rd - 8th Standards
If you are looking for a website that explains and defines subtraction with decimals you have arrived at an excellent resource. There are even practice problems at the very end of the lesson.
Unit Plan
CK-12 Foundation

Ck 12: Elem Math: Subtracting 2 Digit Numbers Without Regrouping

For Students 1st - 2nd Standards
[Free Registration/Login may be required to access all resource tools.] The video shows a subtraction problem with two digit numbers. The video is followed by a series of practice questions to assess student comprehension of the concept.
Whiteboard
ClassFlow

Class Flow: Glowing in the Dark: Two Digit Subtraction

For Teachers 3rd - 5th
[Free Registration/Login Required] This flipchart teaches 2-digit subtraction with and without regrouping using fireflies as manipulatives. It is interactive and self checking.
Activity
Teaching Treasures Publications

Teaching Treasures: Year Four Timed Mental Math (Page 2)

For Students 3rd - 5th Standards
Improve your computations skills in all four operations with this timed interactive worksheet. Solve ten problems in five minutes or less. Problems are presented in horizontal format and answers can be checked immediately. This worksheet...
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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.
Unit Plan
Khan Academy

Khan Academy: Add and Subtract Mixed Numbers With Unlike Denominators 1

For Students 4th - 6th Standards
Practice adding and subtracting mixed numbers with different denominators. No regrouping required. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video or receive hints.
Interactive
NumberNut

Number Nut: Subtraction: Subtracting From Two Digit Numbers

For Students K - 1st Standards
Explains how to subtract from two-digit numbers, with or without regrouping.
Lesson Plan
Alabama Learning Exchange

Alex: Mix It Up!

For Teachers Pre-K - 1st
By now, students have learned that fact families include both addition and subtraction facts. They have also learned that by reversing the order of the addends, they can form related addition facts with the same sum. The students will...
Unit Plan
Khan Academy

Khan Academy: Subtract Within 1000

For Students 2nd - 4th
Subtract with 2 numbers less than 1000. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video or receive hints.
Interactive
Quia

Quia: Subtracting to Win a Million

For Students 1st - 8th Standards
Students will love playing this "Who Wants to be a Millionaire," style game as they work through the subtraction problems. Some of the numbers are large, but there is no regrouping necessary.
Activity
Teaching Treasures Publications

Teaching Treasures: Year Two Math (Page 3)

For Students Pre-K - 1st Standards
Review basic addition and subtraction facts using this interactive worksheet. Problems are presented in horizontal format and offer immediate feedback. With only ten problems, this worksheet could also be used for a quick review or short...
Lesson Plan
Better Lesson

Better Lesson: Cheerful Shoppers

For Teachers 2nd Standards
Second graders love to shop! Students will use their own shopping list to compose a word problem using addition and subtraction with and without regrouping, in order to help them better understand how to problem solve.
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NumberNut

Number Nut: Subtraction: Comparing Subtraction Differences (No Regrouping)

For Students 3rd - 5th
Quiz where the player must calculate the answers for two subtraction problems with one- and two-digit numbers, where there is no regrouping, and then must choose the correct symbol for comparing the differences (i.e., >, <, or =).
Activity
Teaching Treasures Publications

Teaching Treasures: Year Eight Timed Mental Math

For Students 3rd - 8th Standards
This resource provides an interactive worksheet with just ten problems as an independent practice or a quick assessment.
Whiteboard
ClassFlow

Class Flow: Ms. Marsha's Farm Math Review

For Teachers Pre-K - 1st Standards
[Free Registration/Login Required] This flipchart provides addition and subtraction word problems at second grade level, with regrouping.
Website
PBS

Pbs Learning Media: Cooking Contest

For Students 3rd - 8th
In this Cyberchase video segment, Matt uses subtraction to help Digit figure out how much time he has left in a cooking contest with Hacker.
Handout
Cool Math

Coolmath: Coolmath4kids: Subtracting Numbers Within 1000

For Students 3rd - 4th Standards
Step-by-step tutorial showing how to subtract numbers less than 1000 in place value columns with and without regrouping. Includes sample problems to try.
Unit Plan
Khan Academy

Khan Academy: Subtract 1 or 10

For Students 1st - 3rd Standards
Practice subtracting 1 or 10 from a 2-digit number (no regrouping). Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video or receive hints.
Activity
Teaching Treasures Publications

Teaching Treasures: Year Eight Timed Mental Math

For Students 3rd - 8th Standards
Improve your computation skills using this timed interactive worksheet.

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