We're dividing 21551154 by 156 
We want to figure out the number of times 21551154 can be divided by 156.

On to step 1:
2 divided by 156 is 0 with a remainder of 2.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we subtract 0 from 2, we get 2.
Append the next digit (1) from the dividend to 2 and continue with: 21 / 156

Moving on to step 2:
21 divided by 156 is 0 with a remainder of 21.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we subtract 0 from 21, we get 21.
Grab the next digit (5) from the dividend, add it to 21, then carry on: 215 / 156

Moving on to step 3:
156 can be fit into 215 1 times, resulting in a remainder of 59.
Use 1 as the next digit of our solution. 
Result so far: 1.0
If we take 156 away from 215, we end up with 59.
Append the next digit (5) from the dividend to 59 and continue with: 595 / 156

Going ahead to step 4:
156 can be fit into 595 3 times, resulting in a remainder of 127.
Write down 3 as next digit of the result. 
Result so far: 13.0
Deduct 468 from 595 and we're left with 127.
Include the next digit (1) from the dividend after 127, then repeat: 1271 / 156

Advancing to step 5:
The number 156 fits into 1271 8 times, leaving a remainder of 23.
Write down 8 as next digit of the result. 
Result so far: 138.0
If we subtract 1248 from 1271, we get 23.
Include the next digit (1) from the dividend after 23, then repeat: 231 / 156

Let's proceed to step 6:
When dividing 231 by 156, we get 1 with a remainder of 75.
Write down 1 as next digit of the result. 
Result so far: 1381.0
Deduct 156 from 231 and we're left with 75.
Append the next digit (5) from the dividend to 75 and continue with: 755 / 156

Advancing to step 7:
156 goes into 755 4 times with a remainder of 131.
The next digit of our result is 4. 
Result so far: 13814.0
Deduct 624 from 755 and we're left with 131.
Append the next digit (4) from the dividend to 131 and continue with: 1314 / 156

Advancing to step 8:
156 goes into 1314 8 times with a remainder of 66.
The next digit of our result is 8. 
Result so far: 138148.0
Subtracting 1248 from 1314 leaves us with 66.
Since there are no more digits in the dividend, we add a zero to the remainder making it 660, and continue the process.

On to step 9:
If we divide 660 by 156, we get 4 and a remainder of 36.
Record the quotient 4 as the next digit in the result. 
Result so far: 138148.4
Subtract 624 from 660 to get 36.
Since there are no more digits in the dividend, we add a zero to the remainder making it 360, and continue the process.

Going ahead to step 10:
When dividing 360 by 156, we get 2 with a remainder of 48.
The next digit of our result is 2. 
Result so far: 138148.42
If we take 312 away from 360, we end up with 48.
Since there are no more digits in the dividend, we add a zero to the remainder making it 480, and continue the process.

Moving on to step 11:
156 can be fit into 480 3 times, resulting in a remainder of 12.
The next digit of our result is 3. 
Result so far: 138148.423
Subtracting 468 from 480 leaves us with 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Let's proceed to step 12:
156 goes into 120 0 times with a remainder of 120.
Use 0 as the next digit of our solution. 
Result so far: 138148.423
The remainder is 120 after subtracting 0 from 120.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1200, and continue the process.

On to step 13:
1200 divided by 156 is 7 with a remainder of 108.
Use 7 as the next digit of our solution. 
Result so far: 138148.42307
Subtracting 1092 from 1200 leaves us with 108.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1080, and continue the process.

Step 14:
156 can be fit into 1080 6 times, resulting in a remainder of 144.
Put 6 as the next digit of the answer. 
Result so far: 138148.423076
Subtracting 936 from 1080 leaves us with 144.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1440, and continue the process.

Advancing to step 15:
When dividing 1440 by 156, we get 9 with a remainder of 36.
Use 9 as the next digit of our solution. 
Result so far: 138148.4230769
If we take 1404 away from 1440, we end up with 36.
Since there are no more digits in the dividend, we add a zero to the remainder making it 360, and continue the process.

Going ahead to step 16:
360 divided by 156 is 2 with a remainder of 48.
Put 2 as the next digit of the answer. 
Result so far: 138148.42307692
Subtract 312 from 360 to get 48.
Since there are no more digits in the dividend, we add a zero to the remainder making it 480, and continue the process.

After the division, we end up with 138148.42307692 and a remainder of 4.8e-08.