Let's divide 21705024 by 406
Our goal is to divide 21705024 by 406.

Advancing to step 1:
The number 406 fits into 2 0 times, leaving a remainder of 2.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 2 and we're left with 2.
Fetch the next digit (1) from the dividend, attach it to 2 and continue: 21 / 406

On to step 2:
21 divided by 406 is 0 with a remainder of 21.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 21 to get 21.
Grab the next digit (7) from the dividend, add it to 21, then carry on: 217 / 406

Going ahead to step 3:
217 divided by 406 is 0 with a remainder of 217.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 217 and we're left with 217.
Take the next digit (0) from the dividend and append it to 217, then repeat: 2170 / 406

Advancing to step 4:
When dividing 2170 by 406, we get 5 with a remainder of 140.
Use 5 as the next digit of our solution. 
Result so far: 5.0
The remainder is 140 after subtracting 2030 from 2170.
Take the next digit (5) from the dividend and append it to 140, then repeat: 1405 / 406

On to step 5:
If we divide 1405 by 406, we get 3 and a remainder of 187.
Write down 3 as next digit of the result. 
Result so far: 53.0
If we subtract 1218 from 1405, we get 187.
Include the next digit (0) from the dividend after 187, then repeat: 1870 / 406

Moving on to step 6:
1870 divided by 406 is 4 with a remainder of 246.
Use 4 as the next digit of our solution. 
Result so far: 534.0
If we take 1624 away from 1870, we end up with 246.
Take the next digit (2) from the dividend and append it to 246, then repeat: 2462 / 406

Moving on to step 7:
If we divide 2462 by 406, we get 6 and a remainder of 26.
The next digit of our result is 6. 
Result so far: 5346.0
Deduct 2436 from 2462 and we're left with 26.
Append the next digit (4) from the dividend to 26 and continue with: 264 / 406

Advancing to step 8:
When dividing 264 by 406, we get 0 with a remainder of 264.
Write down 0 as next digit of the result. 
Result so far: 53460.0
If we subtract 0 from 264, we get 264.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2640, and continue the process.

Moving on to step 9:
If we divide 2640 by 406, we get 6 and a remainder of 204.
Use 6 as the next digit of our solution. 
Result so far: 53460.6
If we take 2436 away from 2640, we end up with 204.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2040, and continue the process.

Step 10:
The number 406 fits into 2040 5 times, leaving a remainder of 10.
Use 5 as the next digit of our solution. 
Result so far: 53460.65
Subtracting 2030 from 2040 leaves us with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

On to step 11:
When dividing 100 by 406, we get 0 with a remainder of 100.
Write down 0 as next digit of the result. 
Result so far: 53460.65
The remainder is 100 after subtracting 0 from 100.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1000, and continue the process.

Going ahead to step 12:
If we divide 1000 by 406, we get 2 and a remainder of 188.
Use 2 as the next digit of our solution. 
Result so far: 53460.6502
If we take 812 away from 1000, 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.

Advancing to step 13:
406 can be fit into 1880 4 times, resulting in a remainder of 256.
The number 4 becomes the next digit in our result. 
Result so far: 53460.65024
Subtract 1624 from 1880 to get 256.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2560, and continue the process.

Going ahead to step 14:
406 goes into 2560 6 times with a remainder of 124.
The number 6 becomes the next digit in our result. 
Result so far: 53460.650246
The remainder is 124 after subtracting 2436 from 2560.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1240, and continue the process.

Step 15:
If we divide 1240 by 406, we get 3 and a remainder of 22.
Put 3 as the next digit of the answer. 
Result so far: 53460.6502463
The remainder is 22 after subtracting 1218 from 1240.
Since there are no more digits in the dividend, we add a zero to the remainder making it 220, and continue the process.

Moving on to step 16:
406 goes into 220 0 times with a remainder of 220.
The number 0 becomes the next digit in our result. 
Result so far: 53460.6502463
Subtract 0 from 220 to get 220.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2200, and continue the process.

In conclusion, the division gives 53460.6502463 with a balance of 2.2e-07.