We look at the division of 12150986 by 651 
Let's see how many times 651 fits into 12150986.

Moving on to step 1:
When dividing 1 by 651, we get 0 with a remainder of 1.
The next digit of our result is 0. 
Result so far: 0.0
If we take 0 away from 1, we end up with 1.
Fetch the next digit (2) from the dividend, attach it to 1 and continue: 12 / 651

Moving on to step 2:
651 goes into 12 0 times with a remainder of 12.
The next digit of our result is 0. 
Result so far: 0.0
If we take 0 away from 12, we end up with 12.
Grab the next digit (1) from the dividend, add it to 12, then carry on: 121 / 651

Step 3:
If we divide 121 by 651, we get 0 and a remainder of 121.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 121, we end up with 121.
Append the next digit (5) from the dividend to 121 and continue with: 1215 / 651

Let's proceed to step 4:
When dividing 1215 by 651, we get 1 with a remainder of 564.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
If we take 651 away from 1215, we end up with 564.
Take the next digit (0) from the dividend and append it to 564, then repeat: 5640 / 651

Advancing to step 5:
The number 651 fits into 5640 8 times, leaving a remainder of 432.
The next digit of our result is 8. 
Result so far: 18.0
If we take 5208 away from 5640, we end up with 432.
Take the next digit (9) from the dividend and append it to 432, then repeat: 4329 / 651

Step 6:
651 goes into 4329 6 times with a remainder of 423.
Write down 6 as next digit of the result. 
Result so far: 186.0
The remainder is 423 after subtracting 3906 from 4329.
Take the next digit (8) from the dividend and append it to 423, then repeat: 4238 / 651

Advancing to step 7:
If we divide 4238 by 651, we get 6 and a remainder of 332.
Use 6 as the next digit of our solution. 
Result so far: 1866.0
If we take 3906 away from 4238, we end up with 332.
Take the next digit (6) from the dividend and append it to 332, then repeat: 3326 / 651

On to step 8:
651 goes into 3326 5 times with a remainder of 71.
The number 5 becomes the next digit in our result. 
Result so far: 18665.0
Deduct 3255 from 3326 and we're left with 71.
Since there are no more digits in the dividend, we add a zero to the remainder making it 710, and continue the process.

Advancing to step 9:
651 goes into 710 1 times with a remainder of 59.
Put 1 as the next digit of the answer. 
Result so far: 18665.1
Subtract 651 from 710 to get 59.
Since there are no more digits in the dividend, we add a zero to the remainder making it 590, and continue the process.

On to step 10:
651 goes into 590 0 times with a remainder of 590.
Write down 0 as next digit of the result. 
Result so far: 18665.1
Subtract 0 from 590 to get 590.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5900, and continue the process.

Going ahead to step 11:
If we divide 5900 by 651, we get 9 and a remainder of 41.
The next digit of our result is 9. 
Result so far: 18665.109
Deduct 5859 from 5900 and we're left with 41.
Since there are no more digits in the dividend, we add a zero to the remainder making it 410, and continue the process.

Let's proceed to step 12:
410 divided by 651 is 0 with a remainder of 410.
The next digit of our result is 0. 
Result so far: 18665.109
If we subtract 0 from 410, we get 410.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4100, and continue the process.

Going ahead to step 13:
4100 divided by 651 is 6 with a remainder of 194.
The number 6 becomes the next digit in our result. 
Result so far: 18665.10906
Deduct 3906 from 4100 and we're left with 194.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1940, and continue the process.

Let's proceed to step 14:
When dividing 1940 by 651, we get 2 with a remainder of 638.
The next digit of our result is 2. 
Result so far: 18665.109062
Subtract 1302 from 1940 to get 638.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6380, and continue the process.

On to step 15:
If we divide 6380 by 651, we get 9 and a remainder of 521.
Use 9 as the next digit of our solution. 
Result so far: 18665.1090629
Deduct 5859 from 6380 and we're left with 521.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5210, and continue the process.

Step 16:
651 can be fit into 5210 8 times, resulting in a remainder of 2.
Record the quotient 8 as the next digit in the result. 
Result so far: 18665.10906298
The remainder is 2 after subtracting 5208 from 5210.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

The final outcome is 18665.10906298, with a leftover of 2e-09.