We're dividing 21148190 by 439 
We're looking to find how many times 439 goes into 21148190.

Let's proceed to step 1:
If we divide 2 by 439, we get 0 and a remainder of 2.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 2, we get 2.
Append the next digit (1) from the dividend to 2 and continue with: 21 / 439

Let's proceed to step 2:
If we divide 21 by 439, we get 0 and a remainder of 21.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we subtract 0 from 21, we get 21.
Fetch the next digit (1) from the dividend, attach it to 21 and continue: 211 / 439

Step 3:
When dividing 211 by 439, we get 0 with a remainder of 211.
Use 0 as the next digit of our solution. 
Result so far: 0.0
The remainder is 211 after subtracting 0 from 211.
Take the next digit (4) from the dividend and append it to 211, then repeat: 2114 / 439

Step 4:
439 goes into 2114 4 times with a remainder of 358.
Record the quotient 4 as the next digit in the result. 
Result so far: 4.0
Subtracting 1756 from 2114 leaves us with 358.
Bring next digit (8) of the dividend behind the 358 and repeat the process: 3588 / 439

Advancing to step 5:
If we divide 3588 by 439, we get 8 and a remainder of 76.
Write down 8 as next digit of the result. 
Result so far: 48.0
Subtract 3512 from 3588 to get 76.
Bring next digit (1) of the dividend behind the 76 and repeat the process: 761 / 439

Going ahead to step 6:
The number 439 fits into 761 1 times, leaving a remainder of 322.
Write down 1 as next digit of the result. 
Result so far: 481.0
If we subtract 439 from 761, we get 322.
Include the next digit (9) from the dividend after 322, then repeat: 3229 / 439

On to step 7:
If we divide 3229 by 439, we get 7 and a remainder of 156.
Use 7 as the next digit of our solution. 
Result so far: 4817.0
The remainder is 156 after subtracting 3073 from 3229.
Fetch the next digit (0) from the dividend, attach it to 156 and continue: 1560 / 439

Advancing to step 8:
If we divide 1560 by 439, we get 3 and a remainder of 243.
Record the quotient 3 as the next digit in the result. 
Result so far: 48173.0
Subtracting 1317 from 1560 leaves us with 243.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2430, and continue the process.

Let's proceed to step 9:
If we divide 2430 by 439, we get 5 and a remainder of 235.
Put 5 as the next digit of the answer. 
Result so far: 48173.5
If we subtract 2195 from 2430, we get 235.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2350, and continue the process.

Step 10:
When dividing 2350 by 439, we get 5 with a remainder of 155.
Use 5 as the next digit of our solution. 
Result so far: 48173.55
Deduct 2195 from 2350 and we're left with 155.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1550, and continue the process.

The quotient of the division is 48173.55, and the remainder is 0.155.