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this case, the common denominator can be made 3 × 4 = 12(LCM of 3 and

4), i.e., we can find equivalent fractions with fractional unit 1/12.

 Subtraction of fractions with the same fractional unit or denominator

Example : What is 6/7 – 4/7?
To solve this problem, we can again use the rectangular strips. In both
fractions, the fractional unit is the same.

Step 1: Let us first represent the bigger fraction 6/7

Step 2 :

Each shaded part represents 1/7. Now, we need to subtract 4/7.
To do this let us remove 4 of the shaded parts.

So, we are left with 2 shaded parts, i.e., 6/7 – 4/7 = 2/7.