We're dividing 21059738 by 753 
We want to figure out the number of times 21059738 can be divided by 753.

On to step 1:
753 goes into 2 0 times with a remainder of 2.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we take 0 away from 2, we end up with 2.
Include the next digit (1) from the dividend after 2, then repeat: 21 / 753

Going ahead to step 2:
753 can be fit into 21 0 times, resulting in a remainder of 21.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 21 to get 21.
Fetch the next digit (0) from the dividend, attach it to 21 and continue: 210 / 753

Advancing to step 3:
753 goes into 210 0 times with a remainder of 210.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 210 to get 210.
Append the next digit (5) from the dividend to 210 and continue with: 2105 / 753

Step 4:
If we divide 2105 by 753, we get 2 and a remainder of 599.
Write down 2 as next digit of the result. 
Result so far: 2.0
Deduct 1506 from 2105 and we're left with 599.
Grab the next digit (9) from the dividend, add it to 599, then carry on: 5999 / 753

On to step 5:
If we divide 5999 by 753, we get 7 and a remainder of 728.
The number 7 becomes the next digit in our result. 
Result so far: 27.0
Subtract 5271 from 5999 to get 728.
Grab the next digit (7) from the dividend, add it to 728, then carry on: 7287 / 753

On to step 6:
When dividing 7287 by 753, we get 9 with a remainder of 510.
Use 9 as the next digit of our solution. 
Result so far: 279.0
If we take 6777 away from 7287, we end up with 510.
Grab the next digit (3) from the dividend, add it to 510, then carry on: 5103 / 753

Advancing to step 7:
5103 divided by 753 is 6 with a remainder of 585.
The number 6 becomes the next digit in our result. 
Result so far: 2796.0
If we take 4518 away from 5103, we end up with 585.
Append the next digit (8) from the dividend to 585 and continue with: 5858 / 753

Let's proceed to step 8:
When dividing 5858 by 753, we get 7 with a remainder of 587.
Record the quotient 7 as the next digit in the result. 
Result so far: 27967.0
Subtract 5271 from 5858 to get 587.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5870, and continue the process.

Step 9:
The number 753 fits into 5870 7 times, leaving a remainder of 599.
Record the quotient 7 as the next digit in the result. 
Result so far: 27967.7
If we take 5271 away from 5870, we end up with 599.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5990, and continue the process.

Going ahead to step 10:
If we divide 5990 by 753, we get 7 and a remainder of 719.
Use 7 as the next digit of our solution. 
Result so far: 27967.77
If we take 5271 away from 5990, we end up with 719.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7190, and continue the process.

After the division, we end up with 27967.77 and a remainder of 0.719.