Embedded Files
Overview
Overview
Your student will be learning:
- addition and subtraction have an inverse relationship.
- the inverse relationship between addition and subtraction can be used to find subtraction facts.
Example:
2 + 4 = 6 and 4 + 2 = 6 therefore:
6 - 2 = 4 and 6 - 4 = 2
- two or more numbers can be grouped or added in any order.
- basic addition facts that are near doubles can be found using a related doubles fact.
Example:
6 + 7 = (think 6 + 6 = 12 + 1) = 13
- adding and subtracting tens is like adding and subtracting ones.
- two-digit numbers can be broken apart using tens and ones and added in different ways.
Example:
37 + 22 = ___
37 = 30 + 7
22 = 20 + 2
50 + 9 = 59
- patterns on a hundred chart can be used to add or subtract numbers and to develop mental math strategies and number sense.
- model drawing/strip diagrams can be a helpful strategy when solving word problems.
Resources
Resources
- Videos
- Relating Addition and Subtraction. This Khan Academy video demonstrates how the relationship between addition and subtraction helps students with single digit facts.
- Relate Addition and Subtraction. This scholastic video demonstrates the relationship between addition and subtraction. The website also provides practice of addition, subtraction, and solving for the unknown.
- Doubles Doubles. This is a catchy song for children to practice doubles facts.
- Addition by Counting On. This video demonstrates how to add by counting on. It uses everyday items to represent addition.
- Learn about 10s. This is a catchy song to explain subtracting from 10s.
- Addition and Subtraction Word Problems. This Khan Academy video demonstrates the problem solving process using part-part-whole mats.
- Count On or Count Back to Subtract. This instructional video explains how to find an unknown using part-part-whole with counting on and counting back.
- Free Apps
Number Swipe
Number Swipe
Swipe the matching numbers that add up to a multiple of 10 to remove them from the board. The game ends when there are no more combinations to swipe.
Teaching Number Lines
Teaching Number Lines
Children model addition and subtraction on a number line.
Math Slide
Math Slide
Children practice basic addition facts by selecting an answer choice consisting of ten.
Math Fight: Easy Level
Math Fight: Easy Level
Two players compete against each other to be the first to answer a math problem. The first player to answer 10 problems correctly is the winner.
Number Line by Math Learning Center
Number Line by Math Learning Center
This is an interactive number line app that can be used for solving addition and subtraction problems.
A Math Regrouping App: Addition and Subtraction HD
A Math Regrouping App: Addition and Subtraction HD
In this app, addition and subtraction problems with regrouping must be solved. It allows for finger writing on the device to show work.
- Websites
- Second Grade Math Games. Abcya.com has various games for students to practice their addition and subtraction skills.
- 2nd Grade Math Games. This website provides practice for many math skills, including addition and subtraction.
- Math Games and Online Practice. This Soft Schools website offers a variety of skills practice.
- Books
- Ten Friends by Bruce Goldstone. This book uses rhymes and illustrations to suggest different ways to invite ten friends to tea.
- Safari Park by Stuart J. Murphy. In this story, kids have 20 tickets to spend at an amusement park. Each child has to figure out the best way to have the most fun.
- Elevator Magic by Stuart J. Murphy. This story explores subtraction with an elevator ride.
- The Magic Pot by Pleasant DeSpai. This story explores doubles through a magic pot that makes two of everything.
- The Mission of Addition by Brian P. Cleary. This book provides examples of vocabulary used with addition. It also gives examples of addition and includes real world applications.
- The Action of Subtraction by Brian P. Cleary. This book provides examples of vocabulary used with subtraction. It also gives examples of subtraction and includes real world applications.
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