21105150 ÷ 670 
Our goal is to divide 21105150 by 670.

Moving on to step 1:
If we divide 2 by 670, we get 0 and a remainder of 2.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 2 and we're left with 2.
Bring next digit (1) of the dividend behind the 2 and repeat the process: 21 / 670

Let's proceed to step 2:
670 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.
Grab the next digit (1) from the dividend, add it to 21, then carry on: 211 / 670

Let's proceed to step 3:
When dividing 211 by 670, we get 0 with a remainder of 211.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 211 to get 211.
Append the next digit (0) from the dividend to 211 and continue with: 2110 / 670

On to step 4:
If we divide 2110 by 670, we get 3 and a remainder of 100.
Write down 3 as next digit of the result. 
Result so far: 3.0
If we subtract 2010 from 2110, we get 100.
Include the next digit (5) from the dividend after 100, then repeat: 1005 / 670

Advancing to step 5:
The number 670 fits into 1005 1 times, leaving a remainder of 335.
The number 1 becomes the next digit in our result. 
Result so far: 31.0
Subtract 670 from 1005 to get 335.
Bring next digit (1) of the dividend behind the 335 and repeat the process: 3351 / 670

Let's proceed to step 6:
670 goes into 3351 5 times with a remainder of 1.
The number 5 becomes the next digit in our result. 
Result so far: 315.0
If we subtract 3350 from 3351, we get 1.
Take the next digit (5) from the dividend and append it to 1, then repeat: 15 / 670

Let's proceed to step 7:
If we divide 15 by 670, we get 0 and a remainder of 15.
Write down 0 as next digit of the result. 
Result so far: 3150.0
If we subtract 0 from 15, we get 15.
Append the next digit (0) from the dividend to 15 and continue with: 150 / 670

Moving on to step 8:
When dividing 150 by 670, we get 0 with a remainder of 150.
The next digit of our result is 0. 
Result so far: 31500.0
Subtracting 0 from 150 leaves us with 150.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1500, and continue the process.

On to step 9:
The number 670 fits into 1500 2 times, leaving a remainder of 160.
Record the quotient 2 as the next digit in the result. 
Result so far: 31500.2
Subtracting 1340 from 1500 leaves us with 160.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1600, and continue the process.

On to step 10:
When dividing 1600 by 670, we get 2 with a remainder of 260.
Put 2 as the next digit of the answer. 
Result so far: 31500.22
Subtracting 1340 from 1600 leaves us with 260.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2600, and continue the process.

After the division, we end up with 31500.22 and a remainder of 0.26.