# Find the Missing Digits in Addition and Subtraction

How to find the missing digits in the blank spaces?

Example:

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

ONES

TENS

HUNDREDS

THOUSANDS

Take 1 from TENS

Take 1 from THOUSANDS

4 + 1

5

Compensate for the 1 given to Thousands Place.

3.

 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.

 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

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:

B. Find the Missing Digits in Subtraction:

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

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

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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