76090 ÷ 21 
Our goal is to divide 76090 by 21.

Step 1:
21 can be fit into 7 0 times, resulting in a remainder of 7.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 7 after subtracting 0 from 7.
Take the next digit (6) from the dividend and append it to 7, then repeat: 76 / 21

Going ahead to step 2:
The number 21 fits into 76 3 times, leaving a remainder of 13.
Put 3 as the next digit of the answer. 
Result so far: 3.0
The remainder is 13 after subtracting 63 from 76.
Grab the next digit (0) from the dividend, add it to 13, then carry on: 130 / 21

On to step 3:
The number 21 fits into 130 6 times, leaving a remainder of 4.
The next digit of our result is 6. 
Result so far: 36.0
Subtracting 126 from 130 leaves us with 4.
Append the next digit (9) from the dividend to 4 and continue with: 49 / 21

On to step 4:
When dividing 49 by 21, we get 2 with a remainder of 7.
The number 2 becomes the next digit in our result. 
Result so far: 362.0
Deduct 42 from 49 and we're left with 7.
Include the next digit (0) from the dividend after 7, then repeat: 70 / 21

Advancing to step 5:
70 divided by 21 is 3 with a remainder of 7.
Put 3 as the next digit of the answer. 
Result so far: 3623.0
Subtract 63 from 70 to get 7.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

Step 6:
When dividing 70 by 21, we get 3 with a remainder of 7.
Use 3 as the next digit of our solution. 
Result so far: 3623.3
If we take 63 away from 70, we end up with 7.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

On to step 7:
The number 21 fits into 70 3 times, leaving a remainder of 7.
Write down 3 as next digit of the result. 
Result so far: 3623.33
If we take 63 away from 70, we end up with 7.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

Our division results in 3623.33 with a remaining 0.007.