Whole Number : Subtraction

How to subract number:


Example: 99876 -57894 = ?

• Line up the numbers:

   9|9|8|7|6|
-  5|7|8|9|4|
________

• Subtract the numbers starting from place value ones to ten thousands:

         8 17 17
   9|9|8|7|6|
-  5|7|8|9|4|
   4 1 9 8 2

Exercises:

1. 203 - 35 =
2. 72 - 16 =
3. 2180 - 726 =
4. 62731 - 12735 =
5. 7261 - 3815 =
6. 92 - 25 =
7. 18 - 10 =
8. 8271 - 941 =
9. 51426 - 903 =
10. 6251 - 170 =

Whole Numbers: Addition

First, we need to work on place values:

45 971
|  |  | | |___ Ones 1's
|  |  | |____ Tens 10's
|  |  |_____ Hundreds 100's
|  |_______Thousands 1 000's
|_________Ten Thousands 10 000's


If we expand this out, we get:

45971 = 40 000 + 5 000 + 900 + 70 + 1


Write this from up to down:

   4|0|0|0|0|
     |5|0|0|0|
        |9|0|0|
           |7|0|
 +           |1|
   4 5 9 7 1



How to add up numbers:

Example: 53 681 + 7927 = ?

• Line up the numbers:

   5|3|6|8|1|
+   |7|9|2|7|
________

• Add up the numbers starting from place value ones to ten thousands:

      1  1  1
   5|3|6|8|1|
+   |7|9|2|7|
   6 1 6 0 8

Whole Numbers

Whole Numbers

• Whole Numbers are simply the numbers 0, 1, 2, 3, 4, 5, … (and so on) 

 

No fraction!

Counting Numbers

• Counting Numbers are Whole Numbers, but without the zero. Because you can't "count" zero. So they are 1, 2, 3, 4, 5, … (and so on).

Natural Numbers

• Mean either "Counting Numbers" {1, 2, 3, ...}, or "Whole Numbers" {0, 1, 2, 3, ...}, depending on the subject.

Place Value till Ten Thousands

• The position, or place, of a digit in a number written in standard form determines the actual value the digit represents. 
• Below shows the place value for various positions:

Place (underlined)           Name of Position
1 000                                 Ones (units) position
1 000                                 Tens
1 000                                 Hundreds
1 000                                 Thousands
10 000                               Ten Thousands
1 000 000                          Hundred Thousands
1 000 000                          Millions

Place Value

Example
The number 21,040:

• Has a 2 in the ten thousands place,
• a one in the thousands place, 
• a 4 in the tens place, 
• and a 0 in both the hundreds and ones place.
• Can be written as twenty-one thousand and forty.