Missing Terms - CCSS 1.OA.B.4, 1.OA.D.8

Links verified on 03/23/2026

1. Addition Completion.
Click Image to Enlarge		Complete the addition sentence by filling in the missing number. (Sums up to 10)  SEE MORE
2. Addition Equations.
Click Image to Enlarge		What number would complete this sentence? - Find the missing term.  SEE MORE
3. Addition Fill-In.
Click Image to Enlarge		Fill in the blank with the missing term.  SEE MORE
4. Cave Game Subtraction (Class activity).
Click Image to Enlarge		In this class activity, the purpose of the task is for students to practice creating and memorizing subtraction equations, while focusing on missing addends.  SEE MORE
5. Determine the unknown number in each equation.
Click Image to Enlarge		Online quiz that is self checking.  SEE MORE
6. Determine the Unknown Number in the Addition Equation (up to 20).
Click Image to Enlarge		Online quiz that is self checking.  SEE MORE
7. Determine the Unknown Number in the Addition or Subtraction Equation (up to 20).
Click Image to Enlarge		Online quiz that is self checking.  SEE MORE
8. Determine the Unknown Number in the Subtraction Equation (up to 20).
Click Image to Enlarge		Online quiz that is self checking.  SEE MORE
9. Determine The Unknown Whole Number (Classs Activity).
Click Image to Enlarge		Two tasks to practice determining the unknown whole number in an addition or subtraction equation relating three whole numbers. SEE MORE
10. Find A Missing Number.
Click Image to Enlarge		A variety of activities to find the missing numbers.  SEE MORE
11. Find the Missing Number.
Click Image to Enlarge		Generate exercises by selecting the numbers to use (0-99), type of sequence, and number of problems.  SEE MORE
12. Finding the Missing Subtrahend.
Click Image to Enlarge		This activity involves students solving a subtraction equation when the subtrahend is missing. SEE MORE
13. Finding The Unknown Number (YouTube).
Click Image to Enlarge		In this video lesson, learn how to use related equations to determine the unknown whole number in an addition or subtraction equation. SEE MORE
14. Hit the Button.
Click Image to Enlarge		Click on "Number Bonds" and find "Missing Numbers." Choose addition (+ bonds) or subtraction (- bonds). Click on the number that is missing and try to work fast to do as many as possible in 1 minute.  SEE MORE
15. Hundred's Chart Missing Numbers Activity.
Click Image to Enlarge		Complete the Hundreds Chart by filling in the empty boxes with the missing numbers.  SEE MORE
16. Missing Addends (YouTube).
Click Image to Enlarge		This video introduces the concept of finding a missing part. Using both addition and subtraction are discussed, as well as drawing pictures to match a story problem. SEE MORE
17. Missing Numbers In A Series.
Click Image to Enlarge		This is an exercise in which a students has to count and type missing numbers forward based on the starting number.  SEE MORE
18. Missing Term Worksheet.
Click Image to Enlarge		Supply the missing term for ten problems. Self-checking.  SEE MORE
19. Subtraction Completion.
Click Image to Enlarge		Complete the subtraction sentence by filling in the missing number.  SEE MORE
20. Subtraction Fill-In Flash Cards.
Click Image to Enlarge		Fill in the blank with the missing term.  SEE MORE