Subtract Whole Numbers
Subtracting Three Digit Numbers
How to subtract three digit numbers (for example 658  472).
 Place one number above the other so that the hundreds', tens' and ones'
places are lined up. Draw a line under the bottom number.
658
472
 Subtract the digits in the ones' place column (8  2 = 6) and place the
answer below the line in the ones' place column.
658
472
6
 Subtract the numbers in the tens' place column (5  7 = ?). Borrow one
from the hundreds' place to make the top value larger than the bottom
value. After this is done, subtract (15  7 = 8) and place the 8 below the
line in the tens' place column.
5
658
472
86
 Subtract the digits in the hundreds' place column (5  4 = 1) and place
the answer below the line in the hundreds' place column
5
658
472
186
Calculator Practice
Subtracting numbers is a task everyone does daily. Practice
without a pencil and scratch paper builds brain connections. The exercises given
are intended to be used as a learning tool to improve mathematical manipulation,
and also as practice in the accurate use of a calculator.
Find a practice worksheet HERE.
Find audio support HERE.
Subtraction Table
This subtraction table should be recited from memory without
reference to strengthen subtraction principles and memory connections.
Directions: Subtract each number across the top of the table
from each number down the left side. Where the lines interest is the difference
of these two numbers. Look for patterns to aid memorization.
So for this table it is left side minus top side.

1

2

3

4

5

6

7

8

9

10

1

0

1

2

3

4

5

6

7

8

9

2

1

0

1

2

3

4

5

6

7

8

3

2

1

0

1

2

3

4

5

6

7

4

3

2

1

0

1

2

3

4

5

6

5

4

3

2

1

0

1

2

3

4

5

6

5

4

3

2

1

0

1

2

3

4

7

6

5

4

3

2

1

0

1

2

3

8

7

6

5

4

3

2

1

0

1

2

9

8

7

6

5

4

3

2

1

0

1

10

9

8

7

6

5

4

3

2

1

0

