Khan Academy: Missing Numbers in Addition and Subtraction

Whether your pupils need extra help or they simply need to practice their basic computation skills, this packet will do the trick. It includes a written rationale, answer key, and over 10 pages of double-digit addition and subtraction...

Reinforce addition and subtraction with a 30-problem arithmetic worksheet in which scholars add and subtract numbers between one through 10. 

Which numbers are missing on these hundreds charts? Beginning counters fill in the blank squares in a set of hundreds charts. One simply has the numbers 1 and 100, while the others are missing every other number, only even numbers, or...

Scroll down to find four fun addition and subtraction partner game boards, complete with endless opportunities for practice with numbers 0-38. Kids choose numbers from a number box and, depending on the game, either find the sum or the...

The math monster is at it again, this time stealing all the cars and drivers that were to take part in the cart race. If their addition and subtraction facts are up to the challenge, young mathematicians can win the drivers' freedom...

Watch as Sal solves missing numbers in problems like 73 = ___ + 57. [5:43]

Watch Sal find missing numbers between 0 and 120. Includes a video, transcript, and question and answer section. [1:53]

Understanding the inverse relationship between addition and subtraction is essential for developing fluency in young mathematicians. Zoe and RJ explain how three numbers can form fact families that make two addition and two subtraction...

Sal shows some techniques for doing mental addition, such as making groups of 10 and 100. Includes a video, transcript, and question and answer section. [7:27]

In this number sequence activity, students examine 6 number sequences and fill in 1 missing number in each sequence. Next, students use the strategy of counting by ten to complete 5 different number sequences.