Cool Math
Coolmath: Coolmath4kids: Adding Numbers Within 1000
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
Khan Academy
Khan Academy: Addition Using Groups of 10 and 100
In this exercise, students practice addition using groups of 10 and 100. Students receive immediate feedback and have the opportunity to get hints, watch a video tutorial, and try questions repeatedly. CCSS.Math.Content.3.NBT.A.2...
Khan Academy
Khan Academy: Subtract Polynomials (Intro)
Students practice subtracting polynomials with these exercises. They receive immediate feedback and have the opportunity to try questions repeatedly, watch a video, or receive hints.
McGraw Hill
Glencoe Mathematics: Online Study Tools: Subtracting Polynomials
This site gives a short interactive quiz which allows students to self-assess their understanding of the concept of subtracting polynomials.
CK-12 Foundation
Ck 12: Elem Math: Adding Decimals From the Thousandths Place to the Tens Place
[Free Registration/Login may be required to access all resource tools.] This mathematics resource is a video demonstrating addition with decimals to the thousandths place, followed by practice problems adding numbers with digits in the...
National Council of Teachers of Mathematics
Nctm: Illuminations: Grouping and Grazing
A game that reviews grouping in fives and tens, and adding and subtracting. The instuctions are clear and include a video of how to play.
ABCya
Ab Cya: Molly Adds & Subtracts From 10
This educational activity provides word problems with manipulatives for kids to practice adding and subtracting within 10. The word problems are read aloud and have objects that can be used for counting. Children may need assistance from...
ABCya
Ab Cya: Molly Adds & Subtracts From 20
This educational activity provides word problems with manipulatives for kids to practice adding and subtracting within 20. The word problems are read aloud and have objects that can be used for counting. Children may need assistance from...
CK-12 Foundation
Ck 12: Elem Math: Adding Compound Units Metric Units
[Free Registration/Login may be required to access all resource tools.] Video and practice adding two compound units.
K-5 Math Teaching Resources
K 5 Math Teaching Resources: Find the Missing Number [Pdf]
Students complete an activity to explore adding and subtracting by finding the missing number.
Knowledge Share
Super Kids: Addition and Subtraction Worksheet Creator
Create your own addition/subtraction math facts worksheets. Use them in the classroom for practice or timed drills, or at home! Choose from two levels of difficulty, and vertical or horizontal equation format. You input minimum and...
CK-12 Foundation
Ck 12: Math Grade 4
Browse resources related to fourth-grade math standards. Click on a topic for interactive lessons, videos, and extra practice.
CK-12 Foundation
Ck 12: Math Grade 5
Browse resources related to fifth-grade math standards. Click on a topic for interactive lessons, videos, and extra practice.
PBS
Pbs Learning Media: Move That Math: Lesson Plan
Combine addition of numbers identified from playing cards with physical activity to engage students and increase overall fitness. This lesson plan describes a twenty to twenty five minute series of activities that require two decks of...
CK-12 Foundation
Ck 12: Arithmetic: Mental Math to Add and Subtract Decimals
[Free Registration/Login may be required to access all resource tools.] Find sums and differences of decimals using mental math.
National Council of Teachers of Mathematics
The Math Forum: Middle School Archive
This site from the Math Forum provides a list of links to many questions from the Dr. Math archive about exponents. This is a good site to use to direct you to different but associated information on the subject.
Khan Academy
Khan Academy: Practice: Add Within 100 Using a Number Line
Practice adding and subtracting numbers like 54 and 37 using a number line. Numbers used in these problems are all less than 100. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video or...
AAA Math
Aaa Math: All About Fractions
A comprehensive tutorial that contains the following operations: adding fractions, comparing fractions, converting fractions, multiplying fractions, reducing fractions and subtracting fractions. Explanations, interactive practices and...
Khan Academy
Khan Academy: Matrix Equations: Addition and Subtraction
Solve equations where the unknown is a matrix, by using matrix addition and subtraction. Students receive immediate feedback and have the opportunity to try questions repeatedly or receive hints.
Quia
Intermediate Test Prep: Math 6: Solving Two Step Equations
Learn how to solve and explain two-step equations using whole numbers and inverse operations. Complete the lessons and practice activity and then play the interactive games to test your skills.
CK-12 Foundation
Ck 12: Elem Math: Adding, Subtracting, Multiplying, and Dividing
[Free Registration/Login may be required to access all resource tools.] A learning module where students apply the order of operations to solve equations involving the four operations. A video shows how to solve a sample problem. [2:11]...
Scholastic
Scholastic: Math Maven's Mysteries: The Cuckoo Caper
The famous Clockenheimer Cuckoo is missing from Clockenheimer Clocks on Main Street! Help Math Maven get it back by solving a math riddle.
Scholastic
Scholastic Math Maven's Mysteries: The Mystery of Pirate Ringold's Lost Treasure
In this Math Maven mystery, read the legend of Pirate Ringold and his treasure and help Frieda Finditall figure out how much gold there is left to find on this old ship. Your knowledge about addition and subtraction with fractions will...
CK-12 Foundation
Ck 12: Complex Numbers
[Free Registration/Login may be required to access all resource tools.] This lesson covers the powers of i, and adding and subtracting complex numbers, as well as how to plot them in the complex plane. Students examine guided notes,...