# What is 21/28-10/12?

How much is 2128 minus 1012. Step by step solution expressed as a proper or improper fraction, mixed number and decimal form.

• - 112
• 0.0833 (rounded to 4 decimals)

## Step by step solution

Subtract

2128 - 1012 = - 784

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

Multiples of 28 are   28, 56, 84 ....etc

Multiples of 12 are   12, 24, 36, 48, 60, 72, 84 ...etc

The LCM of 28 and 12 is 84. So, the common denominator of 2128 and 1012 is 84. Now change the fractions into equivalent fractions with common denominator

• 2128 - 1012
• 21 * 328 * 3 - 10 * 712 * 7
• 6384 - 7084
2. ### Subtract

• 6384 - 7084
• 63 - 7084
• - 784

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

Simplify

• - 784
• - 112
1. ### Reduce fraction to its lowest terms

• - 784
• - 7 ÷ 784 ÷ 7
• - 112

The greatest common divisor of 7 and 84 is 7, the fraction - 784 can be simplified or reduced to lowest terms by dividing the numerator and denominator by 7.