Subtract Whole Numbers

Subtract Whole Numbers

Add Whole Numbers Subtract Whole Numbers Multiply Whole Numbers Divide Whole Numbers
Add Fractions Subtract Fractions Multiply Fractions Divide Fractions
Add Decimal Numbers Subtract Decimal Numbers Multiply Decimal Numbers Divide Decimal Numbers
  Measurements Arithmetic Main Page Electrician Math Home

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
 

Many electrician workbooks and practice exams are now available 
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Click HERE to see what is available.
The next Journeyman Electrician Course in Port St. Lucie begins September 12th, 2009. Details HERE.
The next Master Electrician Course in Port St. Lucie begins January 9th, 2010. Details HERE.
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