We're dividing 87357878 by 210 
We want to figure out the number of times 87357878 can be divided by 210.

Moving on to step 1:
8 divided by 210 is 0 with a remainder of 8.
The next digit of our result is 0. 
Result so far: 0.0
Subtract 0 from 8 to get 8.
Bring next digit (7) of the dividend behind the 8 and repeat the process: 87 / 210

Step 2:
87 divided by 210 is 0 with a remainder of 87.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 87, we get 87.
Grab the next digit (3) from the dividend, add it to 87, then carry on: 873 / 210

On to step 3:
210 can be fit into 873 4 times, resulting in a remainder of 33.
The number 4 becomes the next digit in our result. 
Result so far: 4.0
If we subtract 840 from 873, we get 33.
Append the next digit (5) from the dividend to 33 and continue with: 335 / 210

Advancing to step 4:
210 goes into 335 1 times with a remainder of 125.
Use 1 as the next digit of our solution. 
Result so far: 41.0
Deduct 210 from 335 and we're left with 125.
Include the next digit (7) from the dividend after 125, then repeat: 1257 / 210

Going ahead to step 5:
The number 210 fits into 1257 5 times, leaving a remainder of 207.
Use 5 as the next digit of our solution. 
Result so far: 415.0
If we subtract 1050 from 1257, we get 207.
Grab the next digit (8) from the dividend, add it to 207, then carry on: 2078 / 210

On to step 6:
210 can be fit into 2078 9 times, resulting in a remainder of 188.
Record the quotient 9 as the next digit in the result. 
Result so far: 4159.0
Subtracting 1890 from 2078 leaves us with 188.
Grab the next digit (7) from the dividend, add it to 188, then carry on: 1887 / 210

On to step 7:
If we divide 1887 by 210, we get 8 and a remainder of 207.
Use 8 as the next digit of our solution. 
Result so far: 41598.0
Deduct 1680 from 1887 and we're left with 207.
Take the next digit (8) from the dividend and append it to 207, then repeat: 2078 / 210

Let's proceed to step 8:
210 can be fit into 2078 9 times, resulting in a remainder of 188.
Record the quotient 9 as the next digit in the result. 
Result so far: 415989.0
If we take 1890 away from 2078, we end up with 188.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1880, and continue the process.

Moving on to step 9:
The number 210 fits into 1880 8 times, leaving a remainder of 200.
The number 8 becomes the next digit in our result. 
Result so far: 415989.8
Deduct 1680 from 1880 and we're left with 200.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2000, and continue the process.

Going ahead to step 10:
210 can be fit into 2000 9 times, resulting in a remainder of 110.
Record the quotient 9 as the next digit in the result. 
Result so far: 415989.89
Subtract 1890 from 2000 to get 110.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1100, and continue the process.

Going ahead to step 11:
210 goes into 1100 5 times with a remainder of 50.
Write down 5 as next digit of the result. 
Result so far: 415989.895
Subtracting 1050 from 1100 leaves us with 50.
Since there are no more digits in the dividend, we add a zero to the remainder making it 500, and continue the process.

Advancing to step 12:
If we divide 500 by 210, we get 2 and a remainder of 80.
Use 2 as the next digit of our solution. 
Result so far: 415989.8952
If we subtract 420 from 500, we get 80.
Since there are no more digits in the dividend, we add a zero to the remainder making it 800, and continue the process.

Going ahead to step 13:
800 divided by 210 is 3 with a remainder of 170.
Record the quotient 3 as the next digit in the result. 
Result so far: 415989.89523
If we take 630 away from 800, we end up with 170.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1700, and continue the process.

On to step 14:
210 goes into 1700 8 times with a remainder of 20.
Write down 8 as next digit of the result. 
Result so far: 415989.895238
The remainder is 20 after subtracting 1680 from 1700.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Advancing to step 15:
210 goes into 200 0 times with a remainder of 200.
Record the quotient 0 as the next digit in the result. 
Result so far: 415989.895238
If we take 0 away from 200, we end up with 200.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2000, and continue the process.

Going ahead to step 16:
If we divide 2000 by 210, we get 9 and a remainder of 110.
Put 9 as the next digit of the answer. 
Result so far: 415989.89523809
If we subtract 1890 from 2000, we get 110.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1100, and continue the process.

The final outcome is 415989.89523809, with a leftover of 1.1e-07.