How to use a calculator for fractions – Step By Step Guide

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Giant calculator producing companies are producing various types of calculators in a regular basis. They are trying to make calculators user friendly but our lacking of knowledge is making the situation complicated. We fear to solve problems and we find the calculator as a sophisticated device. I found some starter who does not know much about a scientific calculator and its functions.

How to use a calculator for fractions – Step By Step Guide

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Solving fractional problems in a scientific or fraction calculator is one of the major problems for all of the newbie. I thought I should write something about fractions calculator with steps. Calculator with fraction button is a common option for maximum scientific as well as graphing calculators. Some calculators also have 3 fraction calculator buttons. So in this article, I’m going to show some basic calculations for fractional problems.


Location of a fraction button

Maximum calculators contain a fraction button. In a Casio scientific calculator, you can find a “/” button under the “CALC” button. Pressing SHIFT+ / button will let you to do mixed fraction. In other calculators, there will be a button for fractional calculation.

Fraction is basically two kinds of. One of them is natural fraction and the other one is mixed fraction. Natural fraction is like ½(half) or ¼ (one fourth) etc. Mixed fractions are 3¼ (three of two fifth) 2⅔ (two of two third) etc. Fractions using a calculator are now easier than before.

Some calculators like Casio fx-100 ms calculator doesn’t have a proper fraction button. Its fractional expression is also not easily understandable. But calculators like Casio fx-991 ES, Casio fx-991 ES Plus, Casio fx-991 EX have a proper fraction button and it displays proper mathematical expression same as textbook.

Quick Comparison – Our Top 5 Calculator

How to use a calculator for fractions

Fractions calculator step by step (Addition Method)

Now I’m going to show how to do fractional calculation in a calculator. At first let’s have a look how to do fractional addition in a calculator.

Formula: a/b + c/d = (ad + bc)/bd

Example: 3/2 + 4/7 = (3x7 + 2x4)/7x2= (21+8)/14 = 29/14

To solve this problem in a calculator you have to follow this procedure:

  Step-1 : After turning on your calculator press the fractional button “/”

  Step-2 : Enter the value for first fraction in the both upper and lower side. You                   have to   press 3+ down arrow+ 2 to enter first fraction.

  Step-3 : Press “+” and then press fractional button “/” again.

  Step-4 : Enter the second fraction as like as you did before for first fraction.                        Enter the values 4 and 7.

  Step-5 : Press “=” button.

  Result: The answer will show at screen. It will be 29/14

Fractions calculator step by step (Subtraction Method)

This is also a very easy task to do in a calculator. At first let’s have a look at the formula.

Formula: a/b - c/d = (ad - bc)/bd

Example: 3/2 - 4/7 = (3x7 - 2x4)/7x2= (21-8)/14 = 13/14

To solve this problem in a calculator you have to follow this procedure:

  Step-1 : After turning on your calculator press the fractional button “/”

  Step-2 : Enter the value for first fraction in the both numerator and                                      denominator side. You have to press 3+ down arrow+ 2 to enter first                    fraction.

  Step-3 : Press “-” and then press fractional button “/” again.

  Step-4 : Enter the second fraction as like as you did before for first fraction.                         Enter the values 4 and 7.

  Step-5 : Press “=” button.

  Result: The answer will show at screen. It will be 13/14

Fractions calculator step by step (Multiplication Method)

Multiplication is also as easy as the other described operations before. But getting result may vary sometimes. But at first let’s have a look at the formula.

Formula: a/b x c/d = ac/bd

Example: 3/2 x 4/7= 12/14 = 6/7 (N.B: The calculator will always give the simplified result)

To solve this problem in a calculator you have to follow this procedure:

  Step-1 : After turning on your calculator press the fractional button “/”

  Step-2 : Enter the value for first fraction in the both numerator and                                      denominator side. You have to press (3+ down arrow+ 2) to enter first                  fraction.

  Step-3 : Press “x” and then press fractional button “/” again.

  Step-4 : Enter the second fraction as like as you did before for first fraction.                        Enter the values 4 and 7.

  Step-5 : Press “=” button.

  Result: The answer will show at screen. It will be 6/7

Fractions calculator step by step (Division Method)

Well, when it comes to the division we have to be careful about this. It is also very easy task. But lack of knowledge and a wrong input will give you a wrong result. The formula is given below.

Formula: a/b ÷ c/d = ad x bc

Example: 3/2 ÷ 4/7 = 3 x 7/ 4 x 2 = 21/8

To solve this problem in a calculator you have to follow this procedure:

  Step-1 : After turning on your calculator press the fractional button “/”

  Step-2 : Enter the value for first fraction in the both numerator and                                      denominator side. You have to press (3+ down arrow+ 2) to enter first                  fraction.

  Step-3 : Press “÷” and then press fractional button “/” again.

  Step-4 : Enter the second fraction as like as you did before for first fraction.                        Enter the values 4 and 7.

  Step-5 : Press “=” button.

  Result: The answer will show at screen. It will be 21/8

Some extra useful operations of fraction

Fraction of complex number

Remember! If you want to do complex number related fraction calculation, your calculator must remain in the complex mode. To set your calculator to complex mode follow this procedure.

  Step-1 : Turn on the calculator. Press the Menu or MODE button.

  Step-2 : Choose the CMPLX mode. Find where it is.

  Step-3 : Press Esc or EXIT. Now you are well set.

  I will talk about a complex division. It will be two complex numbers is divided by a fraction. Now imagine 3+2i as a numerator and 2+3i as a denominator where “i” is an imaginary number. The expression will be like “(3+2i)/ (2+3i)”. Let’s solve this in a calculator.

To solve this problem in a calculator you have to follow this procedure:

  Step-1 : After turning on your calculator press the fractional button “/”

  Step-2 : Enter the value for first complex number in the numerator. You have                     to press (“3”+ “+” + “2”+ “i”) to enter first fraction.

  Step-3 : Press “Down Arrow” and then input the second complex number                          again.

  Step-4 : : Enter the second complex number as like as you did before for first                      complex number. Enter (“2” + “+” + “3”+ “i”).

  Step-5 : Press “=” button.

  Result: The answer will show at screen. It will be (12/13) - (5/13)i

Mixed fraction

Sometimes a fractional number will be expressed as a mixed fraction. Let’s have a look what is it. If 5/2 is expressed as 2½ then we will call 2½ a mixed fraction. The formula is simple.

Formula: a b/c = {(a x c) + b}/c

Example: 2 ½ = {(2x2) + 1}/2= 5/2

To do these in your calculator try this method.

  Step-1 : Press “SHIFT”+ “/” after turning on your calculator.

  Step-2 : Input 2 as the first number. Then enter the numerator as 1 and                              denominator as 2 like before.

  Step-3 : Press “=” button.

Result: The result will be 5/2 and it will be shown at the screen

Equivalent fractions

Equivalent fraction means multiplying or dividing the numerator and denominator with the same number.

Formula: a/b = (a x d)/ (b x d) or a/b = (a ÷ d)/(b ÷ d)

Example: 2/3 = (2x5)/ (3x5) = 10/15 or, 10/15 = (10÷5)/ (15÷5) = 2/3

To solve this problem in a calculator you have to follow this procedure

  Step-1 : After turning on your calculator press the fractional button “/”.

  Step-2 : Enter the value for first fraction in the both upper and lower side. You                  have to press “10” + “÷” + “5” for numerator.

  Step-3 : Press “15” + “÷” + “5” for denominator.

  Step-4 : Press “=” button.

Result: The answer will be shown at screen. It will be 2/3.

See! How easy to do fraction in calculator. So there is no need to worry about it anymore. Also there are some other types of calculations for fraction. But these are the basics of fraction calculation.
I hope I have told everything about this method. I guess formulas and examples will also help you to understand this properly. Now fractions using a calculator will be much easier. It is enough for today. Thanks for reading.

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