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Subtracting whole numbersSubtracting 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  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 to make it look simpler as illustrated below  Another example Once again, study the following example carefully. If you understand it and the one before, you should be well on your way to mastering subtracting  Step #1 Borrow a 10 from 2 tens The problem becomes  Step #2 Borrow 1 hundred from 4 hundreds. 1 hundred = 10 tens. Then add 10 tens to 1 ten to make it 11 tens  Step #3 Borrow 1 thousand from 5 thousands. 1 thousand = 10 hundreds. Then add 10 hundreds to 3 hundreds to make it 13 hundreds Then, just subtract now since all numbers at the bottom are smaller than the number on top 
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IntroductionArithmeticGeometryGraph it!Probability and statisticsReal life mathSequences and patternsAlgebraResourcesTeachers!
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|Reading and writing whole numbers
|Adding whole numbers
|Subtracting whole numbers
|Multiplying whole numbers
|Dividing whole numbers
|Finding the average
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