EC
D1-25: 3-Digit Subtraction
ExpertChild
Name:
Date:
Start Time:
Grade:
Number of mistakes:
:
A+
0
End Time:
A
1
B
2-3
C
4-6
:
D
7+
Subtract Across Zeros
Example: What is 600 – 243?
Step-1
• Are there enough ones in 600 to subtract
3 ones? No (3 > 0).
• Since there are 0 tens, we can’t borrow from tens.
So, borrow 1 hundred and regroup as 10 tens.
• 6 hundreds 0 tens = 5 hundreds 10 tens.
Step-2
• Borrow 1 ten and regroup as 10 ones.
• 10 tens 0 ones = 9 tens 10 ones
Step-3
• Subtract the ones (10 – 3 = 7).
• Subtract the tens (9 – 4 = 5).
• Subtract the hundreds (5 – 2 = 3).
Copyright  2004 by ExpertChild Institute of Education.
5 10
6 0 0
– 2 4 3
9
5 10 10
6 0 0
– 2 4 3
9
5 10 10
6 0 0
– 2 4 3
3 5 7
1
EC
ExpertChild
D1-25: 3-Digit Subtraction
Math Concept:
While subtracting across zeros, you may need to regroup
the hundreds first.
Subtract. Show your work.
[1]
Step-1
Step-2
Step-3
4 10
9
4 10 10
9
4 10 10
5 0 0
– 2 2 3
5 0 0
– 2 2 3
2 7 7
5 0 0
– 2 2 3
[2]
600
– 236
[4]
500
– 443
[3]
900
– 748
[5]
700
– 645
Copyright  2004 by ExpertChild Institute of Education.
2
EC
ExpertChild
D1-25: 3-Digit Subtraction
Subtract.
You may not need to regroup in some problems.
(Show your work)
[1]
800
– 425
[6]
500
– 363
[2]
900
– 558
[7]
700
– 516
[3]
600
– 363
[8]
500
– 321
[4]
400
– 174
[9]
800
– 640
[5]
300
– 200
[10]
600
– 539
Copyright  2004 by ExpertChild Institute of Education.
3
EC
ExpertChild
Subtract.
D1-25: 3-Digit Subtraction
(Show your work)
[1]
300
– 173
[6]
800
– 506
[2]
200
– 196
[7]
500
– 235
[3]
900
– 654
[8]
400
– 108
[4]
600
– 267
[9]
500
– 423
[5]
700
– 431
[10]
400
– 262
Copyright  2004 by ExpertChild Institute of Education.
4
EC
D1-25: 3-Digit Subtraction
ExpertChild
Algebra
Find the missing numbers. Show your work.
[1]
21 + ____ = 34
[4]
30 + ____ = 57
(Solve 34 – 21 = ___)
[2]
19 + ____ = 28
[5]
____ + 51 = 67
[3]
____ + 13 = 41
[6]
____ + 22 = 53
Word Problems
Solve the following problems.
[7]
What number do you need to add to 13 to get 28?
Hints: Solve 28 – 13 = ____.
Answer: ______
[8]
What number do you need to add to 24 to get 43?
Answer: ______
[9]
What number do you need to add to 45 to get 57?
Answer: ______
Copyright  2004 by ExpertChild Institute of Education.
5
EC
ExpertChild
D1-25: 3-Digit Subtraction
Word Problems
(Predict and Test)
[1]
The sum of two numbers is 12. Their difference is 4. What
are the numbers?
Hints: Choose a number. Subtract 4 to find the other number. Then, test to see if
the sum is 12.
• Choose 5,
Other number is: 5 – 4 = 1,
Sum is: 5 + 1 = 6
Sum is less than 12. So, choose a bigger number.
• Choose 10,
Other number is: 10 – 4 = 6,
Sum is: 10 + 6 = 16
Sum is more than 12. So, choose a smaller number.
• Choose 8,
Other number is: 8 – 4 = 4,
Sum is: 8 + 4 = 12
Sum is equal to than 12. So, 8 and 4 are correct numbers.
Answer: 8 and 4
[2]
The sum of two numbers is 8. Their difference is 2. What are
the numbers? (Show your work)
Hints: Choose a number. Subtract 2 to find the other number. Then, test to see if
the sum is 8.
Answer: _________
Copyright  2004 by ExpertChild Institute of Education.
6