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Find the Missing Digits in Addition and Subtraction

How to find the missing digits in the blank spaces?

Example:

Find the Missing Digits

Add the ONES: 5 + 9 = 14 

Regroup as 1 Ten and 4 Ones

Add the TENS: 2 + 1 carry over = 3

Write 2 in the box to make 3 + 2 = 5 

Add the HUNDREDS: 4 + 1 = 5

Add the THOUSANDS: 6 + 2 = 8

Write 2 in the box. 0

Missing Digits

ONES

TENS

HUNDREDS

THOUSANDS

Missing Numbers

Take 1 from TENS

Take 1 from THOUSANDS

4 + 1

5

Compensate for the 1 given to Thousands Place.


3. 

Missing Digits in Addition

          Steps:

I: Add ones. 9 + 4 + 4 = 17. Write 7 under ones, carry 1 to tens.

II: Add tens leaving the . 1 + 3 + 1 = 5. If 5 + 6 = 11, then we get 1 in tens place. Write 6 in the . Carry 1 to hundreds.

III: Add the hundreds including the carried 1. 1 + 5 + 2 + 6 = 14. We get 4 in the hundreds place. Carry 1 to thousands.

IV: Add thousands leaving the . 1 + 3 + 8 = 12. 12 + 1 = 13. Write 1 in the .


4. 

Find the Missing Digits in Addition

          Steps:

I: Add ones leaving the . 4 + 6 = 10. 10 + 5 = 15, then we get 5 in the ones place. Write 5 in the . Carry 1 to tens place.

II: Add tens. 1 + 3 + 4 + 9 = 17. Write 7 in the tens place, carry 1 to hundreds place.

III: Add the hundreds leaving the . 1 + 5 +3 = 9. 9 + 2 = 11, then we get 1 in the hundreds place. Write 2 in the . Carry 1 to thousands place.

IV: Add thousands leaving the . 1 + 6 + 1 = 8; 8 + 1 = 9. Write 1 in the .


Worksheet on Find the Missing Digits:

A. Find the Missing Digits in Addition:

I. Replace by the correct digit.

(i)        □  2   1   7

     +    3    8   1   

         13    □  3   1

(ii)       3   4   5   1   

       +  1   2  □  2   3

      □  7   1    3   7


Answer:

I. (i) 9 2 1 7

     + 3 8 1 4

      13 0 3 1


(ii) 3 4 5 1 4

  + 1 2 6 2 3

     4 7 1 3 7


II. Fill in each with the correct digits:

Missing Digits in Addition


Answer:

Missing Digits in Addition - Answer


III. What are the missing numbers in the circles?

Each number in the centre is the sum of the two numbers on the side.

Missing Numbers in the Circles


B. Find the Missing Digits in Subtraction:

I. Replace each * by the correct digit in each of the following.

Missing Digits in Subtraction


Answer:

Missing Digits in Subtraction Answer



II. Find the missing digit.

(i)         9  □ □ □ □ □

         -  3  8   9   4   2  1 

            5  7   9   0   5   2 


(ii)        5    5  4  8

         -  □ 6  2  3   

             1  8  3  0  9 


Answer:

II. (i)      9  6  8  4  7  3

           -  3  8  9  4   2  1 

              5  7  9  0   5  2 


(ii)           5    5   4   8

          -   3   6   2   3   

               1  8   3   0   9 



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Related Concept

Addition

Word Problems on Addition

Subtraction

Check for Subtraction and Addition

Word Problems Involving Addition and Subtraction

Estimating Sums and Differences

Find the Missing Digits

Multiplication

Multiply a Number by a 2-Digit Number

Multiplication of a Number by a 3-Digit Number

Multiply a Number

Estimating Products

Word Problems on Multiplication

Multiplication and Division

Terms Used in Division

Division of Two-Digit by a One-Digit Numbers

Division of Four-Digit by a One-Digit Numbers

Division by 10 and 100 and 1000

Dividing Numbers

Estimating the Quotient

Division by Two-Digit Numbers

Word Problems on Division





4th Grade Math Activities

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