Let's divide 358670 by 21
We want to figure out the number of times 358670 can be divided by 21.

Step 1:
If we divide 3 by 21, we get 0 and a remainder of 3.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 3 and we're left with 3.
Take the next digit (5) from the dividend and append it to 3, then repeat: 35 / 21

Step 2:
When dividing 35 by 21, we get 1 with a remainder of 14.
Write down 1 as next digit of the result. 
Result so far: 1.0
Deduct 21 from 35 and we're left with 14.
Fetch the next digit (8) from the dividend, attach it to 14 and continue: 148 / 21

Let's proceed to step 3:
If we divide 148 by 21, we get 7 and a remainder of 1.
Put 7 as the next digit of the answer. 
Result so far: 17.0
Deduct 147 from 148 and we're left with 1.
Fetch the next digit (6) from the dividend, attach it to 1 and continue: 16 / 21

On to step 4:
If we divide 16 by 21, we get 0 and a remainder of 16.
The number 0 becomes the next digit in our result. 
Result so far: 170.0
Deduct 0 from 16 and we're left with 16.
Include the next digit (7) from the dividend after 16, then repeat: 167 / 21

Moving on to step 5:
When dividing 167 by 21, we get 7 with a remainder of 20.
Record the quotient 7 as the next digit in the result. 
Result so far: 1707.0
Subtract 147 from 167 to get 20.
Append the next digit (0) from the dividend to 20 and continue with: 200 / 21

Let's proceed to step 6:
If we divide 200 by 21, we get 9 and a remainder of 11.
Use 9 as the next digit of our solution. 
Result so far: 17079.0
The remainder is 11 after subtracting 189 from 200.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

Going ahead to step 7:
The number 21 fits into 110 5 times, leaving a remainder of 5.
The next digit of our result is 5. 
Result so far: 17079.5
The remainder is 5 after subtracting 105 from 110.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Advancing to step 8:
50 divided by 21 is 2 with a remainder of 8.
Write down 2 as next digit of the result. 
Result so far: 17079.52
Subtract 42 from 50 to get 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Let's proceed to step 9:
If we divide 80 by 21, we get 3 and a remainder of 17.
The number 3 becomes the next digit in our result. 
Result so far: 17079.523
If we subtract 63 from 80, we get 17.
Since there are no more digits in the dividend, we add a zero to the remainder making it 170, and continue the process.

Let's proceed to step 10:
When dividing 170 by 21, we get 8 with a remainder of 2.
The next digit of our result is 8. 
Result so far: 17079.5238
If we take 168 away from 170, we end up with 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Let's proceed to step 11:
21 goes into 20 0 times with a remainder of 20.
The number 0 becomes the next digit in our result. 
Result so far: 17079.5238
The remainder is 20 after subtracting 0 from 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Step 12:
If we divide 200 by 21, we get 9 and a remainder of 11.
The next digit of our result is 9. 
Result so far: 17079.523809
Deduct 189 from 200 and we're left with 11.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

Going ahead to step 13:
110 divided by 21 is 5 with a remainder of 5.
Put 5 as the next digit of the answer. 
Result so far: 17079.5238095
If we subtract 105 from 110, we get 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

On to step 14:
50 divided by 21 is 2 with a remainder of 8.
The next digit of our result is 2. 
Result so far: 17079.52380952
Subtract 42 from 50 to get 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

The final outcome is 17079.52380952, with a leftover of 8e-09.