# What is 21/13-4/28?

How much is 2113 minus 428. Step by step solution expressed as a proper or improper fraction, mixed number and decimal form.

• 13491
• 1 4391
• 1.4725 (rounded to 4 decimals)

## Step by step solution

Subtract

2113 - 428 = 536364

1. ### Find common denominator by finding the Least Common Multiple(LCM)

Multiples of 13 are   13, 26, 39, 52, 65, 78, 91, ..., 364 ....etc

Multiples of 28 are   28, 56, 84, 112, 140, 168, ..., 364 ...etc

The LCM of 13 and 28 is 364. So, the common denominator of 2113 and 428 is 364. Now change the fractions into equivalent fractions with common denominator

• 2113 - 428
• 21 * 2813 * 28 - 4 * 1328 * 13
• 588364 - 52364
2. ### Subtract

• 588364 - 52364
• 588 - 52364
• 536364

Subtract the numerators and place the difference over the common denominator.

Simplify

• 536364
• 13491
• 1 4391
1. ### Reduce fraction to its lowest terms

• 536364
• 536 ÷ 4364 ÷ 4
• 13491

The greatest common divisor of 536 and 364 is 4, the fraction 536364 can be simplified or reduced to lowest terms by dividing the numerator and denominator by 4.

2. ### Convert improper fraction 13491 to mixed number

• 13491
• 1 4391

134 divided by 91 is 1 with a remainder of 43