What is 1/3 minus 1/7 in fraction?
1/3 minus 1/7 equals to 4/21 in fraction form.
Learn how to find what is 1/3 minus 1/7 in fraction form just in a few minutes. We have covered the easiest method to write 1/3 - 1/7 as a fraction and decimal.
Summary: 1/3 minus 1/7
Since both the fractions have the unequal denominators, you have to find the equivalent fractions for 1/3 and 1/7 having identical denominators before starting adding the fractions. Find the LCM of denominators, 21 is the LCM of 3 and 7. Multiply the LCM 21 with all the numerators and denominators of both fractions (1/3 x 21/21) - (1/7 x 21/21) and simplify further in order to have the common denominators. By simplifying the fraction subtraction expression becomes 4/21.
The below workout with step by step calculation shows how to find what is the difference between two fractions by subtracting a fraction 1/7 from 1/3. For different, unequal or unlike denominators, use any one of the following methods to find the equivalent fraction for 1/3 minus 1/7.
1. LCM method
2. Cross multiplication method.
1/3-1/7 using LCM Method:
What is 1/3 minus 1/7 as a fraction?
step 1 Observe the input parameters and what to be found:
Input:
Fraction A: 1/3
Fraction B: 1/7
What to be found?
1/3-1/7 = ?
Find what's the difference between 1/3 and 1/7.
step 2 Compare the denominators of fractions 1/3 and 1/7 to identify whether it is a like or unlike fraction subtraction. Since the denominators of given fractions 1/3 and 1/7 are not equal, it is said to be unlike fractions subtraction.
step 3For unlike fractions subtraction, find the LCM (least common multiple) of both denominators of fractions 1/3 and 1/7:
The LCM of 3 and 7 is 21.
step 4 Write the fractions 1/3 and 1/7 in the subtraction expression form and multiply LCM with all the numerators and denominators of both fractions.
=1/3-1/7
=(1 x 21)/(3 x 21)-(1 x 21)/(7 x 21)
step 5 Simplify the expression to have common denominator:
=7/21-3/21
step 6 Take the common values out and rewrite the above expression like the below:
=1/21 x (7/1-3/1)
=1/21 x (7 - 3)
step 7Simplify the above expression further:
=1/21 x 4
=4/21
1/3-1/7=4/21
Hence,
1/3 minus 1/7 equals to 4/21 in fraction.
1/3-1/7 using Cross Multiplication Method:
step 1 Observe the input parameters and what to be found:
Input:
Fraction A: 1/3
Fraction B: 1/7
What to be found?
1/3-1/7 = ?
Find what's the difference between 1/3 and 1/7.
step 2 Find the product of numerator of Fraction A and denominator of Fraction B (1 x 7), find the product of numerator of Fraction B and denominator of Fraction A (1 x 3), and find the product of both denominators of Fraction A and Fraction B (3 x 7) and rewrite the equation as like the below:
= (1 x 7) - (1 x 3)/(3 x 7)
step 3 Simplify and rewrite the fraction:
= (7 - 3)/21
1/3-1/7 = 4/21
Hence,
1/3 minus 1/7 = 4/21