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
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:
Answer:
B. Find the Missing Digits in Subtraction:
I. Replace each * by the correct digit in each of the following.
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 4 5 4 8
 3 6 2 3 9
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 2Digit Number
● Multiplication
of a Number by a 3Digit Number
● Multiply a Number
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● Word
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and Division
● Terms Used in
Division
● Division
of TwoDigit by a OneDigit Numbers
● Division
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● Division
by 10 and 100 and 1000
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4th Grade Math Activities
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