Расчет дроби 6/7 - 1/21 = 17/21

The online fraction calculator allows you to perform basic actions with fractions: addition, subtraction, multiplication and division. As well as reduction, reduction to a common denominator and simplification.


To calculate the sum, difference, product or quotient of two fractions and get a detailed solution, enter the numerator and denominator of each fraction and, if available, the integer part. Next, select the necessary operation from the list. If necessary, enter a negative fraction, put a minus sign "-" in the integer part of the fraction.

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6
7
-
1
21
=
17
21
Solution:
6
7
-
1
21
=
6*3
7*3
-
1
21
=
18
21
-
1
21
=
18-1
21
=
17
21
Detailed explanation of the solution:
1.Bringing to a common denominator
6
7
-
1
21
=
6*3
7*3
-
1
21
=
18
21
-
1
21
2.Subtractionfractions with common denominators
18
21
-
1
21
=
18-1
21
=
17
21

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