Let's divide 21239415 by 186
Let's see how many times 186 fits into 21239415.

Going ahead to step 1:
186 goes into 2 0 times with a remainder of 2.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 2 and we're left with 2.
Fetch the next digit (1) from the dividend, attach it to 2 and continue: 21 / 186

Advancing to step 2:
186 goes into 21 0 times with 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.
Take the next digit (2) from the dividend and append it to 21, then repeat: 212 / 186

Let's proceed to step 3:
186 goes into 212 1 times with a remainder of 26.
Put 1 as the next digit of the answer. 
Result so far: 1.0
Subtracting 186 from 212 leaves us with 26.
Bring next digit (3) of the dividend behind the 26 and repeat the process: 263 / 186

Advancing to step 4:
If we divide 263 by 186, we get 1 and a remainder of 77.
Put 1 as the next digit of the answer. 
Result so far: 11.0
Deduct 186 from 263 and we're left with 77.
Bring next digit (9) of the dividend behind the 77 and repeat the process: 779 / 186

Step 5:
779 divided by 186 is 4 with a remainder of 35.
Use 4 as the next digit of our solution. 
Result so far: 114.0
The remainder is 35 after subtracting 744 from 779.
Grab the next digit (4) from the dividend, add it to 35, then carry on: 354 / 186

Going ahead to step 6:
354 divided by 186 is 1 with a remainder of 168.
The next digit of our result is 1. 
Result so far: 1141.0
Deduct 186 from 354 and we're left with 168.
Fetch the next digit (1) from the dividend, attach it to 168 and continue: 1681 / 186

On to step 7:
186 goes into 1681 9 times with a remainder of 7.
The next digit of our result is 9. 
Result so far: 11419.0
If we take 1674 away from 1681, we end up with 7.
Bring next digit (5) of the dividend behind the 7 and repeat the process: 75 / 186

Step 8:
186 goes into 75 0 times with a remainder of 75.
Use 0 as the next digit of our solution. 
Result so far: 114190.0
Subtracting 0 from 75 leaves us with 75.
Since there are no more digits in the dividend, we add a zero to the remainder making it 750, and continue the process.

On to step 9:
186 goes into 750 4 times with a remainder of 6.
Put 4 as the next digit of the answer. 
Result so far: 114190.4
Deduct 744 from 750 and we're left with 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Moving on to step 10:
When dividing 60 by 186, we get 0 with a remainder of 60.
Put 0 as the next digit of the answer. 
Result so far: 114190.4
Deduct 0 from 60 and we're left with 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

On to step 11:
186 can be fit into 600 3 times, resulting in a remainder of 42.
Use 3 as the next digit of our solution. 
Result so far: 114190.403
If we subtract 558 from 600, we get 42.
Since there are no more digits in the dividend, we add a zero to the remainder making it 420, and continue the process.

Step 12:
If we divide 420 by 186, we get 2 and a remainder of 48.
Put 2 as the next digit of the answer. 
Result so far: 114190.4032
Subtract 372 from 420 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.

Step 13:
If we divide 480 by 186, we get 2 and a remainder of 108.
The next digit of our result is 2. 
Result so far: 114190.40322
Subtracting 372 from 480 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.

Our division results in 114190.40322 with a remaining 0.000108.