Subtract Fraction Numbers

Subtracting Fractions

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
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Subtracting fractions

This is a topic useful to an electrician working with building plans. Many times a measurement can be calculated by subtracting one measurement from another. They almost always involve fractions. 

Example, what is 25 feet 4 1/2 inches minus 11 feet 5 1/8 inch equal?

So it is 25 feet 4.5 inches minus 11 feet 5.125 inches.

Or, 24 feet 16.5 inches minus 11 feet 5.125 inches

Answer 13 feet 11.375 inches.

HERE are practice problems on this topic.

Listen to an audio file on this topic HERE.

Fractions can also be subtracted while being left as fractions. Here is an example.

The steps for subtracting fractions are the same as for addition. The only difference is substituting subtraction for addition. If we wish to subtract 1/8 from 4/8, we can follow the steps outlined above.

  1. Determine whether the fractions have the same denominator. If the denominators are the same, move to step 4.

They are the same, so we can skip to step 4.

  1. Subtract the numerators of the fractions.

  1. Simplify the resulting fraction.

This fraction, 8/3, is in its simplest form.

As you can see, addition and subtraction of fractions is similar to adding and subtracting whole numbers. The important point is to be sure the fractions being added or subtracted have the same denominator.

You should now know how to add, subtract, multiply and divide fractions. Try the practice below to be sure you understand how to perform these operations on fractions.

 

Find a practice worksheet HERE. MORE

Listen to an audio file on this topic HERE. MORE

 

 

Many electrician workbooks and practice exams are now available 
as digital downloads for immediate use. 
Click HERE to see what is available.

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