Whole Number Subtraction

Document Sample
Whole Number Subtraction Powered By Docstoc
					                       Whole Number Subtraction

Whole Number Subtraction

Whole numbers are easy to remember. They're not fractions, they're not decimals, they're simply whole
numbers. The only thing that makes them different than natural numbers is that we include the zero
when we are referring to whole numbers. However, some mathematicians will also include the zero in
natural numbers and I'm not going to argue the point. I'll accept both if a reasonable argument is
presented. Whole numbers are 1, 2, 3, 4, and so on. Natural numbers are what you use when you are
counting one to one objects. You may be counting pennies or buttons or cookies. When you start using
1,2,3,4 and so on, you are using the counting numbers or to give them a proper title, you are using the
natural numbers.Subtracting whole numbers is the inverse operation of adding whole numbers.

Instead of adding two numbers to get a sum, you are removing one number from another to get a
difference First, look at the following simple simple subtraction problems, The first is 8 − 4 = 4.
Thinking about money, you have 8 dollars and you spend 4, you are left with 4, Subtractions with one
digit are usually fairly easy. Things start getting complicated when you have more than one digit and
you cannot remove the number at the bottom from the number on top such as when doing 85 − 8 ,
Study the following example carefully because the concept of borrowing a ten is illustrated here Since
you could not remove 8 from 5, you borrowed a ten from 8 tens and add that to 5 to make it 15 You can
also write the problem without the tens and the ones.
                                   Know More About :- Operations of Rational Numbers                                                           Page : 1/3
No Borrowing :- To subtract whole numbers we write them as in an addition problem and subtract
each digit moving from the right to the left. Example:

   - 34      Note that 9 - 4 = 5,   8 - 3 = 5, and 7 - 0 = 7

Borrowing is Necessary :- If when subtracting digits, the top number is smaller than the bottom,
borrowing becomes necessary. We borrow one from the digit to the left. Example: Find 41 - 9

      4 11
   -     9    We have written 41 as 30 + 11. Notice the three in the new tens digit.

Checking Your Work :- We can think of subtraction as the reverse of addition. Example

To check that 41 - 9 = 32, we can work out 32 + 9:

   + 9       Since 2 + 9 = 11, we have carried the 1.

                                    Read More About :- Whole Numbers Multiplication                                                           Page : 2/3
     Thank You


Shared By: