Khan Academy: Missing Numbers Between 0 and 120

In this math worksheet, students add numbers using numbers between 0 and 10. Problems are lined up vertically. An answer sheet can be created by clicking on the link at the bottom of the page.  

First graders are asked to find the missing numbers in subtraction and addition equations. Each missing number is represented with a box and appears as an addend, subtrahend, sum, or difference.

In this missing numbers instructional activity, students fill in missing numbers to complete a set of 8 problems using addition or subtraction. A reference web site for additional resources is given.

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

Demonstrates how to find missing numbers in addition and subtraction equations within 100. [5:44]

Sal uses a number line to compare numbers less than or equal to 10. Includes a video, transcript, and question and answer section. [1:30]

Practice finding missing numbers in a list of numbers between 0 and 120. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video or receive hints.

In this number sequence worksheet, 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.

In this missing numbers and patterns instructional activity, 1st graders fill in 10 missing numbers while figuring out the patterns in 6 lines of numbers.

Sal breaks the number 18 into 10 and 8 using monkeys. Includes a video, transcript, and question and answer section. [2:57]