Let's divide 53121007 by 261
We want to figure out the number of times 53121007 can be divided by 261.

Going ahead to step 1:
If we divide 5 by 261, we get 0 and a remainder of 5.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 5, we get 5.
Take the next digit (3) from the dividend and append it to 5, then repeat: 53 / 261

Moving on to step 2:
If we divide 53 by 261, we get 0 and a remainder of 53.
The next digit of our result is 0. 
Result so far: 0.0
Subtracting 0 from 53 leaves us with 53.
Bring next digit (1) of the dividend behind the 53 and repeat the process: 531 / 261

Going ahead to step 3:
The number 261 fits into 531 2 times, leaving a remainder of 9.
Put 2 as the next digit of the answer. 
Result so far: 2.0
The remainder is 9 after subtracting 522 from 531.
Grab the next digit (2) from the dividend, add it to 9, then carry on: 92 / 261

On to step 4:
If we divide 92 by 261, we get 0 and a remainder of 92.
Write down 0 as next digit of the result. 
Result so far: 20.0
If we subtract 0 from 92, we get 92.
Grab the next digit (1) from the dividend, add it to 92, then carry on: 921 / 261

Let's proceed to step 5:
The number 261 fits into 921 3 times, leaving a remainder of 138.
Write down 3 as next digit of the result. 
Result so far: 203.0
Deduct 783 from 921 and we're left with 138.
Fetch the next digit (0) from the dividend, attach it to 138 and continue: 1380 / 261

Going ahead to step 6:
1380 divided by 261 is 5 with a remainder of 75.
The number 5 becomes the next digit in our result. 
Result so far: 2035.0
If we take 1305 away from 1380, we end up with 75.
Bring next digit (0) of the dividend behind the 75 and repeat the process: 750 / 261

Let's proceed to step 7:
261 goes into 750 2 times with a remainder of 228.
The number 2 becomes the next digit in our result. 
Result so far: 20352.0
If we take 522 away from 750, we end up with 228.
Take the next digit (7) from the dividend and append it to 228, then repeat: 2287 / 261

Let's proceed to step 8:
261 goes into 2287 8 times with a remainder of 199.
Use 8 as the next digit of our solution. 
Result so far: 203528.0
Deduct 2088 from 2287 and we're left with 199.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1990, and continue the process.

Step 9:
When dividing 1990 by 261, we get 7 with a remainder of 163.
The number 7 becomes the next digit in our result. 
Result so far: 203528.7
The remainder is 163 after subtracting 1827 from 1990.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1630, and continue the process.

Let's proceed to step 10:
261 can be fit into 1630 6 times, resulting in a remainder of 64.
Use 6 as the next digit of our solution. 
Result so far: 203528.76
Deduct 1566 from 1630 and we're left with 64.
Since there are no more digits in the dividend, we add a zero to the remainder making it 640, and continue the process.

Going ahead to step 11:
When dividing 640 by 261, we get 2 with a remainder of 118.
The number 2 becomes the next digit in our result. 
Result so far: 203528.762
The remainder is 118 after subtracting 522 from 640.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1180, and continue the process.

Let's proceed to step 12:
261 can be fit into 1180 4 times, resulting in a remainder of 136.
Record the quotient 4 as the next digit in the result. 
Result so far: 203528.7624
Subtract 1044 from 1180 to get 136.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1360, and continue the process.

Going ahead to step 13:
The number 261 fits into 1360 5 times, leaving a remainder of 55.
Use 5 as the next digit of our solution. 
Result so far: 203528.76245
Subtract 1305 from 1360 to get 55.
Since there are no more digits in the dividend, we add a zero to the remainder making it 550, and continue the process.

On to step 14:
If we divide 550 by 261, we get 2 and a remainder of 28.
The number 2 becomes the next digit in our result. 
Result so far: 203528.762452
Subtracting 522 from 550 leaves us with 28.
Since there are no more digits in the dividend, we add a zero to the remainder making it 280, and continue the process.

Let's proceed to step 15:
When dividing 280 by 261, we get 1 with a remainder of 19.
The next digit of our result is 1. 
Result so far: 203528.7624521
Subtracting 261 from 280 leaves us with 19.
Since there are no more digits in the dividend, we add a zero to the remainder making it 190, and continue the process.

Going ahead to step 16:
190 divided by 261 is 0 with a remainder of 190.
Write down 0 as next digit of the result. 
Result so far: 203528.7624521
Subtract 0 from 190 to get 190.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1900, and continue the process.

The final outcome is 203528.7624521, with a leftover of 1.9e-07.