CK-12 Foundation
Ck 12: Elem Math: Arbitrary Digits (Numbers Up to 100,000)
[Free Registration/Login may be required to access all resource tools.] A video and practice questions where students are given up to five digits and must make numbers that match various statements. [2:04]
CK-12 Foundation
Ck 12: Elem Math: Arranging Numbers in Specific Order: Numbers to 1000
[Free Registration/Login may be required to access all resource tools.] A video and practice questions where students are shown how to put a set of numbers up to 1000 into numerical order, which they then try on their own. [2:18]
CK-12 Foundation
Ck 12: Elem Math: Calculating Quotients (Numbers Up to 100,000)
[Free Registration/Login may be required to access all resource tools.] In this learning module, students are presented with a large number and must state how many of another number would divide into it. An accompanying video...
CK-12 Foundation
Ck 12: Elem Math: Subtracting Decimals by Inserting Place Holding Zeroes
[Free Registration/Login may be required to access all resource tools.] A video and practice questions on how to subtract decimal numbers using place-holding zeroes. [1:48]
CK-12 Foundation
Ck 12: Elem Math: Subtract Decimals From the Thousandths Place to the Tens Place
[Free Registration/Login may be required to access all resource tools.] A video and practice questions on how to subtract decimal numbers from the tens place to the thousandths decimal place. [0:47]
CK-12 Foundation
Ck 12: Elem Math: Rounding the Same Decimal to Different Decimal Places
[Free Registration/Login may be required to access all resource tools.] A video and practice questions where students are presented with a decimal number and must round it to three different decimal place value positions. [2:14]
Lawrence Hall of Science
The Math Page: Skill in Arithmetic: Add Whole Numbers, Add Decimals
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.
Annenberg Foundation
Annenberg Learner: Operations
Anneberg Learner: Operations the source provides addition, subtraction, multiplication, and division. It also provides an understanding of its relationships to whole numbers.
Lawrence Hall of Science
The Math Page: Skill in Arithmetic: The Meaning of Subtraction, and Mental Calculation
This website explains and defines basic subtraction. There are practice problems at the very end of this lesson.
Discovery Education
Discovery Education: Web Math: See How Two Numbers Add Together
WebMath offers a good addition practice site. Students can use this site to check their homework assignment. An explanation is given regarding how each answer was arrived at.
Discovery Education
Discovery Education: Web Math: How to Subtract Two Numbers
WebMath offers a good practice site for basic subtraction. Children can type in the problem and an answer is given with explanation. A good site to check homework problems.
Cool Math
Coolmath: Coolmath4kids: Lattice Multiplication
Demonstrates step by step how to use the lattice method for multiplying numbers.
Cool Math
Coolmath: Coolmath4kids: Division: Standard Algorithm
Short tutorial that breaks down simple division step by step using the standard algorithm where you divide, multiply, and subtract, then repeat. Includes sample problems to try.
Lawrence Hall of Science
The Math Page: Skill in Arithmetic: The Meaning of Decimals
This website from The Math Page explains and defines decimals.
Lawrence Hall of Science
The Math Page: Skill in Arithmetic: Subtracting Whole Numbers and Decimals
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.
National Institute of Educational Technologies and Teacher Training (Spain)
Ministerio De Educacion: Calculo Mental Todo Terreno
Practice your mental math with this application by finding the sum of two: whole numbers, integers, decimals or fractions. You can choose two different levels of difficulty.
Cool Math
Coolmath: Coolmath4kids: Subtracting Numbers Within 1000
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.
Lesson Tutor
Lesson Tutor: Addition and Subtraction of Decimals
This site is an online lesson plan and practice problems for students learning how to add and subtract two decimal values are provided here. Detailed explanation of both the methods and the practice questions are provided for easy...
Cool Math
Coolmath: Decimals How to Add Decimals
Learn how to add decimals by lining up the decimals.
Science Struck
Science Struck: Steps and Examples on How to Divide Decimals
Demonstrates division of decimals by whole numbers and by decimal numbers.
CK-12 Foundation
Ck 12: Elem Math: Differences of Whole Numbers to 1000 (Grade 4)
[Free Registration/Login may be required to access all resource tools.] This learning module features five videos and a set of practice questions in which students subtract numbers with up to 3 digits to find the difference.