We're dividing 12281621 by 906 
We want to figure out the number of times 12281621 can be divided by 906.

Step 1:
1 divided by 906 is 0 with a remainder of 1.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 1 and we're left with 1.
Include the next digit (2) from the dividend after 1, then repeat: 12 / 906

Advancing to step 2:
If we divide 12 by 906, we get 0 and a remainder of 12.
Put 0 as the next digit of the answer. 
Result so far: 0.0
The remainder is 12 after subtracting 0 from 12.
Bring next digit (2) of the dividend behind the 12 and repeat the process: 122 / 906

Advancing to step 3:
The number 906 fits into 122 0 times, leaving a remainder of 122.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 122 and we're left with 122.
Fetch the next digit (8) from the dividend, attach it to 122 and continue: 1228 / 906

On to step 4:
1228 divided by 906 is 1 with a remainder of 322.
Put 1 as the next digit of the answer. 
Result so far: 1.0
Subtracting 906 from 1228 leaves us with 322.
Append the next digit (1) from the dividend to 322 and continue with: 3221 / 906

Going ahead to step 5:
The number 906 fits into 3221 3 times, leaving a remainder of 503.
The number 3 becomes the next digit in our result. 
Result so far: 13.0
The remainder is 503 after subtracting 2718 from 3221.
Bring next digit (6) of the dividend behind the 503 and repeat the process: 5036 / 906

Advancing to step 6:
If we divide 5036 by 906, we get 5 and a remainder of 506.
Write down 5 as next digit of the result. 
Result so far: 135.0
The remainder is 506 after subtracting 4530 from 5036.
Bring next digit (2) of the dividend behind the 506 and repeat the process: 5062 / 906

Moving on to step 7:
906 can be fit into 5062 5 times, resulting in a remainder of 532.
Write down 5 as next digit of the result. 
Result so far: 1355.0
If we subtract 4530 from 5062, we get 532.
Append the next digit (1) from the dividend to 532 and continue with: 5321 / 906

Advancing to step 8:
When dividing 5321 by 906, we get 5 with a remainder of 791.
Record the quotient 5 as the next digit in the result. 
Result so far: 13555.0
If we subtract 4530 from 5321, we get 791.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7910, and continue the process.

Moving on to step 9:
The number 906 fits into 7910 8 times, leaving a remainder of 662.
Record the quotient 8 as the next digit in the result. 
Result so far: 13555.8
Subtracting 7248 from 7910 leaves us with 662.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6620, and continue the process.

Advancing to step 10:
6620 divided by 906 is 7 with a remainder of 278.
The number 7 becomes the next digit in our result. 
Result so far: 13555.87
If we take 6342 away from 6620, we end up with 278.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2780, and continue the process.

On to step 11:
906 can be fit into 2780 3 times, resulting in a remainder of 62.
The next digit of our result is 3. 
Result so far: 13555.873
Subtracting 2718 from 2780 leaves us with 62.
Since there are no more digits in the dividend, we add a zero to the remainder making it 620, and continue the process.

Step 12:
906 can be fit into 620 0 times, resulting in a remainder of 620.
Record the quotient 0 as the next digit in the result. 
Result so far: 13555.873
If we take 0 away from 620, we end up with 620.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6200, and continue the process.

Going ahead to step 13:
When dividing 6200 by 906, we get 6 with a remainder of 764.
Write down 6 as next digit of the result. 
Result so far: 13555.87306
Subtracting 5436 from 6200 leaves us with 764.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7640, and continue the process.

Advancing to step 14:
906 goes into 7640 8 times with a remainder of 392.
Write down 8 as next digit of the result. 
Result so far: 13555.873068
If we subtract 7248 from 7640, we get 392.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3920, and continue the process.

Moving on to step 15:
906 can be fit into 3920 4 times, resulting in a remainder of 296.
Record the quotient 4 as the next digit in the result. 
Result so far: 13555.8730684
The remainder is 296 after subtracting 3624 from 3920.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2960, and continue the process.

Moving on to step 16:
2960 divided by 906 is 3 with a remainder of 242.
The number 3 becomes the next digit in our result. 
Result so far: 13555.87306843
Subtract 2718 from 2960 to get 242.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2420, and continue the process.

The final outcome is 13555.87306843, with a leftover of 2.42e-07.