Practice finding the missing value in an addition or subtraction equation involving negative numbers.

[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...

[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...

[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.

[Free Registration/Login may be required to access all resource tools.] The video shows how to determine the missing number sentence by using fact families.

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.

The famous Clockenheimer Cuckoo is missing from Clockenheimer Clocks on Main Street! Help Math Maven get it back by solving a math riddle.

Help Math Maven solve this mystery! Items are missing from several hotel rooms, but some addition and subtraction clues have been left behind. Use your skills to figure out where the thief will strike next!

[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...

[Free Registration/Login may be required to access all resource tools.] This is a video and practice problems demonstrate finding missing numbers using order of operations and working backwards. Operations include addition, subtraction,...

[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...

[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...

[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...

[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...

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.

[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...

[Free Registration/Login may be required to access all resource tools.] The video shows how to use addition and subtraction to keep an equation balanced by working backwards to determine the missing value. The video is followed by...

[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...

[Free Registration/Login may be required to access all resource tools.] The video shows how to determine the missing number sentence when adding and subtracting 3-digit numbers by using fact families.

[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...

Find the missing numbers in the fact family number sentences.

Funky Mummy is a mobile-friendly number facts game. Play this game to practice quick recall of addition, subtraction and multiplication facts.

Students are asked to solve a word problem with both addends unknown. They will write an equation and draw a picture to use to explain their answer.

Great resource to practice and strengthen math skills pertaining to number bonds. Math worksheets are printable, may be customized, and include answer keys.