We look at the division of 187464 by 21 
We want to figure out the number of times 187464 can be divided by 21.

On to step 1:
21 can be fit into 1 0 times, resulting in a remainder of 1.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we subtract 0 from 1, we get 1.
Grab the next digit (8) from the dividend, add it to 1, then carry on: 18 / 21

Step 2:
When dividing 18 by 21, we get 0 with a remainder of 18.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 18 and we're left with 18.
Bring next digit (7) of the dividend behind the 18 and repeat the process: 187 / 21

Going ahead to step 3:
187 divided by 21 is 8 with a remainder of 19.
Write down 8 as next digit of the result. 
Result so far: 8.0
If we subtract 168 from 187, we get 19.
Bring next digit (4) of the dividend behind the 19 and repeat the process: 194 / 21

Going ahead to step 4:
21 goes into 194 9 times with a remainder of 5.
Put 9 as the next digit of the answer. 
Result so far: 89.0
Subtracting 189 from 194 leaves us with 5.
Grab the next digit (6) from the dividend, add it to 5, then carry on: 56 / 21

Going ahead to step 5:
When dividing 56 by 21, we get 2 with a remainder of 14.
Record the quotient 2 as the next digit in the result. 
Result so far: 892.0
Deduct 42 from 56 and we're left with 14.
Include the next digit (4) from the dividend after 14, then repeat: 144 / 21

Advancing to step 6:
If we divide 144 by 21, we get 6 and a remainder of 18.
Use 6 as the next digit of our solution. 
Result so far: 8926.0
The remainder is 18 after subtracting 126 from 144.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

Let's proceed to step 7:
21 can be fit into 180 8 times, resulting in a remainder of 12.
The number 8 becomes the next digit in our result. 
Result so far: 8926.8
If we subtract 168 from 180, we get 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Going ahead to step 8:
21 can be fit into 120 5 times, resulting in a remainder of 15.
Record the quotient 5 as the next digit in the result. 
Result so far: 8926.85
Subtract 105 from 120 to get 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Moving on to step 9:
If we divide 150 by 21, we get 7 and a remainder of 3.
Write down 7 as next digit of the result. 
Result so far: 8926.857
Subtract 147 from 150 to get 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Moving on to step 10:
30 divided by 21 is 1 with a remainder of 9.
The next digit of our result is 1. 
Result so far: 8926.8571
The remainder is 9 after subtracting 21 from 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

On to step 11:
21 goes into 90 4 times with a remainder of 6.
Record the quotient 4 as the next digit in the result. 
Result so far: 8926.85714
If we take 84 away from 90, we end up 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.

Advancing to step 12:
21 goes into 60 2 times with a remainder of 18.
The number 2 becomes the next digit in our result. 
Result so far: 8926.857142
Subtract 42 from 60 to get 18.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

Step 13:
If we divide 180 by 21, we get 8 and a remainder of 12.
Record the quotient 8 as the next digit in the result. 
Result so far: 8926.8571428
Subtracting 168 from 180 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.

Step 14:
21 can be fit into 120 5 times, resulting in a remainder of 15.
Put 5 as the next digit of the answer. 
Result so far: 8926.85714285
If we take 105 away from 120, we end up with 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

The final result is 8926.85714285 with a remainder of 1.5e-08.