Let's divide 51235858 by 213
We want to figure out the number of times 51235858 can be divided by 213.

On to step 1:
If we divide 5 by 213, we get 0 and a remainder of 5.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 5, we end up with 5.
Include the next digit (1) from the dividend after 5, then repeat: 51 / 213

Advancing to step 2:
213 can be fit into 51 0 times, resulting in a remainder of 51.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 51, we end up with 51.
Bring next digit (2) of the dividend behind the 51 and repeat the process: 512 / 213

Advancing to step 3:
512 divided by 213 is 2 with a remainder of 86.
Write down 2 as next digit of the result. 
Result so far: 2.0
Subtract 426 from 512 to get 86.
Bring next digit (3) of the dividend behind the 86 and repeat the process: 863 / 213

Moving on to step 4:
When dividing 863 by 213, we get 4 with a remainder of 11.
The next digit of our result is 4. 
Result so far: 24.0
If we take 852 away from 863, we end up with 11.
Grab the next digit (5) from the dividend, add it to 11, then carry on: 115 / 213

On to step 5:
213 can be fit into 115 0 times, resulting in a remainder of 115.
The number 0 becomes the next digit in our result. 
Result so far: 240.0
If we take 0 away from 115, we end up with 115.
Grab the next digit (8) from the dividend, add it to 115, then carry on: 1158 / 213

Let's proceed to step 6:
If we divide 1158 by 213, we get 5 and a remainder of 93.
Put 5 as the next digit of the answer. 
Result so far: 2405.0
The remainder is 93 after subtracting 1065 from 1158.
Take the next digit (5) from the dividend and append it to 93, then repeat: 935 / 213

Advancing to step 7:
If we divide 935 by 213, we get 4 and a remainder of 83.
Use 4 as the next digit of our solution. 
Result so far: 24054.0
Subtract 852 from 935 to get 83.
Fetch the next digit (8) from the dividend, attach it to 83 and continue: 838 / 213

Going ahead to step 8:
838 divided by 213 is 3 with a remainder of 199.
Write down 3 as next digit of the result. 
Result so far: 240543.0
Deduct 639 from 838 and we're left with 199.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1990, and continue the process.

Advancing to step 9:
213 can be fit into 1990 9 times, resulting in a remainder of 73.
Put 9 as the next digit of the answer. 
Result so far: 240543.9
The remainder is 73 after subtracting 1917 from 1990.
Since there are no more digits in the dividend, we add a zero to the remainder making it 730, and continue the process.

Going ahead to step 10:
The number 213 fits into 730 3 times, leaving a remainder of 91.
Use 3 as the next digit of our solution. 
Result so far: 240543.93
The remainder is 91 after subtracting 639 from 730.
Since there are no more digits in the dividend, we add a zero to the remainder making it 910, and continue the process.

Step 11:
213 goes into 910 4 times with a remainder of 58.
Put 4 as the next digit of the answer. 
Result so far: 240543.934
If we take 852 away from 910, we end up with 58.
Since there are no more digits in the dividend, we add a zero to the remainder making it 580, and continue the process.

Going ahead to step 12:
213 goes into 580 2 times with a remainder of 154.
Record the quotient 2 as the next digit in the result. 
Result so far: 240543.9342
If we subtract 426 from 580, we get 154.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1540, and continue the process.

On to step 13:
213 can be fit into 1540 7 times, resulting in a remainder of 49.
The number 7 becomes the next digit in our result. 
Result so far: 240543.93427
The remainder is 49 after subtracting 1491 from 1540.
Since there are no more digits in the dividend, we add a zero to the remainder making it 490, and continue the process.

Advancing to step 14:
The number 213 fits into 490 2 times, leaving a remainder of 64.
The next digit of our result is 2. 
Result so far: 240543.934272
Deduct 426 from 490 and we're left with 64.
Since there are no more digits in the dividend, we add a zero to the remainder making it 640, and continue the process.

Let's proceed to step 15:
213 can be fit into 640 3 times, resulting in a remainder of 1.
Write down 3 as next digit of the result. 
Result so far: 240543.9342723
Deduct 639 from 640 and we're left with 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Going ahead to step 16:
213 goes into 10 0 times with a remainder of 10.
The number 0 becomes the next digit in our result. 
Result so far: 240543.9342723
Subtract 0 from 10 to get 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Our division results in 240543.9342723 with a remaining 1e-08.