Primary Resources
Primary Resources: Basic Addition and Subtraction
An extensive collection of teacher resources to help in teaching and reviewing the concepts of basic addition and subtraction. There are many worksheets, activities, PowerPoint presentations, smartboard activities, Word, Excel, and pdf...
CK-12 Foundation
Ck 12: Elem Math: Adding and Subtracting Missing Number
[Free Registration/Login may be required to access all resource tools.] The resource is a video showing students how to find a missing number in a multi-step addition and subtraction problem using inverse operations. Adaptive practice...
CK-12 Foundation
Ck 12: Elem Math: Adding, Subtracting, and Multiplying Missing Number
[Free Registration/Login may be required to access all resource tools.] A learning module where students must apply the order of operations to find the missing numbers in equations involving addition, subtraction, and multiplication. A...
Khan Academy
Khan Academy: Addition & Subtraction: Find the Missing Value
Practice finding the missing value in an addition or subtraction equation involving negative numbers. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video or receive hints.
Khan Academy
Khan Academy: Addition & Subtraction: Find the Missing Value
Practice finding the missing value in an addition or subtraction equation involving negative numbers.
CK-12 Foundation
Ck 12: Elem Math: Selecting the Incorrect Subtraction Sentence Ii
[Free Registration/Login may be required to access all resource tools.] The video shows how to finding the missing number in a two-digit subtraction problem by working backwards. The video is followed by a series of practice questions to...
CK-12 Foundation
Ck 12: Elem Math: Finding the Subtraction Sentence by Pattern Numbers Up to 20
[Free Registration/Login may be required to access all resource tools.] The video shows how to find a pattern in a series of subtraction problems to determine the missing problem in the set. The video is followed by additional problems...
CK-12 Foundation
Ck 12: Elem Math: Completing the Subtraction Sentence Numbers Up to 20
[Free Registration/Login may be required to access all resource tools.] The video shows how to use a model to determine the missing number in a subtraction problem. The video is followed by practice problems to assess student...
CK-12 Foundation
Ck 12: Elem Math: Completing the Subtraction Sentence Numbers to 100
[Free Registration/Login may be required to access all resource tools.] The video describes how to fill in a missing number in a 2-digit subtraction sentence. The video is followed by practice problems to assess student understanding of...
CK-12 Foundation
Ck 12: Elem Math: Adding and Subtracting With Parentheses
[Free Registration/Login may be required to access all resource tools.] The resource includes a video tutorial on how to find a missing number in a multi-operational problem by working backwards. The video is followed by practice...
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.
CK-12 Foundation
Ck 12: Elem Math: Subtraction Complete the Subtraction Sentence
[Free Registration/Login may be required to access all resource tools.] In this learning module, students are shown a subtraction sentence with numbers up to 1000 and must fill in a missing number. An accompanying video demonstrates the...
CK-12 Foundation
Ck 12: Elem Math: Fact Families Numbers to 1000
[Free Registration/Login may be required to access all resource tools.] The video describes how to determine what number sentence is missing in the fact family.
Topmarks Online
Topmarks: Subtraction Grids
Can you meet the challenge to see how many subtraction calculations you can do in two minutes? There are different levels and you can choose either one or two missing numbers to make your number sentence correct.
SMART Technologies
Smart: Colorful Painter Fact Families
Find the missing numbers in the fact family number sentences.
CK-12 Foundation
Ck 12: Elem Math: Filling in the Missing or Sign Numbers to 100
[Free Registration/Login may be required to access all resource tools.] The video works through 2-digit addition and subtraction problems to determine which number sentence coincides with the given value. The video is followed by...
CK-12 Foundation
Ck 12: Elem Math: Subtraction Complete the Subtraction Sentence
[Free Registration/Login may be required to access all resource tools.] The video describes how to work backwards working with 3-digit numbers to determine what number is missing in the subtraction sentence. The video is followed by...
CK-12 Foundation
Ck 12: Elem Math: Subtraction Complete the Subtraction Sentence
[Free Registration/Login may be required to access all resource tools.] The video describes how to work backwards working with 3-digit numbers to determine what number is missing in the subtraction sentence. The video is followed by...
Math Slice
Math Slice: Math Crossword Slice Special Test
Use this interactive math crossword puzzle to build number sense skills. Simply fill in the missing numbers based on the operation. Immediate feedback given to responses.
CK-12 Foundation
Ck 12: Elem Math: Filling in the Missing or Sign Numbers to 1000
[Free Registration/Login may be required to access all resource tools.] The video works through a 3-digit addition problem to determine if the correct operation for the number sentence is addition or subtraction. The video is followed by...
CK-12 Foundation
Ck 12: Elem Math: Add and Subtract to 100 Mixed Operations and Word Problems
[Free Registration/Login may be required to access all resource tools.] This is a set of practice problems where students solve addition and subtraction problems in order to determine missing numbers to keep the equation balanced. When...