15/7 subtracted by 21/3 in Fraction Form

The result of 15/7 subtracted by 21/3 is: -5 1/7

Step-by-Step Solution

Step 1: Understand the Problem

We need to subtract the fraction $\frac{2}{1} 3$ from $\frac{1}{5} 7$ .

Step 2: Find the Least Common Multiple (LCM)

To subtract fractions, we need a common denominator. The LCM of 7 and 3 is 21.

Step 3: Convert Fractions to Equivalent Fractions

Convert $\frac{1}{5} 7$ to $\frac{45}{2} 1$
Convert $\frac{2}{1} 3$ to $\frac{147}{2} 1$

Step 4: Subtract the Numerators

Subtract the numerators: 45 - 147 = -102

Step 5: Simplify the Fraction

We can simplify $\frac{-}{1} 0221$ to its lowest form.
The greatest common divisor (GCD) of -102 and 21 is 3.
Dividing both numerator and denominator by the GCD, we get $\frac{-}{3} 47$ .

Step 6: Convert to Mixed Number

The fraction $\frac{-}{3} 47$ can be written as the mixed number $- 5 \frac{1}{7}$ .

Final Answer

The result of 15/7 subtracted by 21/3 is:

\frac{15}{7} - \frac{21}{3} = - 5 \frac{1}{7}

Understanding Fraction Subtraction

How to Subtract Fractions

To subtract fractions, you need to ensure they have a common denominator. Then subtract the numerators:

$\frac{a}{b} - \frac{c}{d} = \frac{a d - b c}{b d}$ (when denominators are different)

Or simply $\frac{a}{b} - \frac{c}{b} = \frac{a - c}{b}$ (when denominators are the same)

Why Simplify Fractions?

Simplifying fractions makes them easier to work with and understand. A fraction is in its simplest form when the numerator and denominator have no common factors other than 1.

To simplify a fraction, divide both the numerator and denominator by their greatest common divisor (GCD).

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