These word problems represent the "Add To" contexts for addition and subtraction.
An interactive simulation that teaches about place value, addition, and subtraction by adding, breaking apart, and combining numbers by making tens and focusing on place value. This simulation can either be downloaded or played online and includes handouts, lesson plans, and additional materials.
The purpose of this task is for students to select 2 numbers from a set of 3 that sum to 9. The task can be completed for sums equaling any number. Teachers may choose to ask students to write the simple equations they select.
Practice adding and subtracting within one hundred with these multiple-choice problems.
Khan Academy learning modules include a Community space where users can ask questions and seek help from community members. Educators should consult with their Technology administrators to determine the use of Khan Academy learning modules in their classroom. Please review materials from external sites before sharing with students.
Practice adding and subtracting within one hundred with these multiple-choice problems.
Khan Academy learning modules include a Community space where users can ask questions and seek help from community members. Educators should consult with their Technology administrators to determine the use of Khan Academy learning modules in their classroom. Please review materials from external sites before sharing with students.
Gain an understanding of how to add and subtract integers by viewing examples and a video lesson. [0:56]
An extensive selection of teacher resources to aide in teaching and reviewing addition and subtraction of two and three digit numbers, inverse operations, counting on, and other mental strategies for addition and subtraction. Resources include worksheets, flash activities, powerpoint presentation, smartboard activities, and Word, Excel, and pdf files for the teacher's use.
This site from Washington State University provides properties and rules of addition and multiplication that help with proofs.
In this challenging instructional task students relate addition and subtraction problems to money and to situations and goals related to saving money.
This word problem may be used for instructional or assessment purposes, depending on where students are in their understanding of addition and how the teacher supports them.
The purpose of this task is for students to select 2 numbers from a set that sum to 5 (or any other number).
Students gain experience and practice with three types of word problems using the "Take From" context: result unknown, change unknown, and start unknown.
This is a rectangle subdivision task; ideally instead of counting each square. students should break the letters into rectangles, multiply to find the areas, and add up the areas. However, students should not be discouraged from using individual counting to start if they are stuck. Often students will get tired of counting and devise the shortcut method themselves.
This short video and interactive assessment activity is designed to teach second graders an overview of subtraction (numbers to 100).
Demonstrates how to subtract 40 from 65 using drawings of base ten cubes to represent 1s and 10s. [2:37]
Khan Academy learning modules include a Community space where users can ask questions and seek help from community members. Educators should consult with their Technology administrators to determine the use of Khan Academy learning modules in their classroom. Please review materials from external sites before sharing with students.
Demonstrates how to subtract 4 from 46 using drawings of base ten cubes to represent 1s and 10s. [2:45]
Khan Academy learning modules include a Community space where users can ask questions and seek help from community members. Educators should consult with their Technology administrators to determine the use of Khan Academy learning modules in their classroom. Please review materials from external sites before sharing with students.
Demonstrates how to subtract 23 from 65 by first breaking each number into tens and ones. [2:36]
Khan Academy learning modules include a Community space where users can ask questions and seek help from community members. Educators should consult with their Technology administrators to determine the use of Khan Academy learning modules in their classroom. Please review materials from external sites before sharing with students.
This short video and interactive assessment activity is designed to teach second graders about subtracting 3 numbers - word problems.
Sal solves a word problem involving mixed number subtraction by using a visual model. [3:08]
Khan Academy learning modules include a Community space where users can ask questions and seek help from community members. Educators should consult with their Technology administrators to determine the use of Khan Academy learning modules in their classroom. Please review materials from external sites before sharing with students.
This short video and interactive assessment activity is designed to teach second graders about subtracting one-digit numbers - word problems.