21111980 ÷ 456 
Let's see how many times 456 fits into 21111980.

On to step 1:
2 divided by 456 is 0 with a remainder of 2.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtract 0 from 2 to get 2.
Fetch the next digit (1) from the dividend, attach it to 2 and continue: 21 / 456

Going ahead to step 2:
456 goes into 21 0 times with a remainder of 21.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 21 and we're left with 21.
Bring next digit (1) of the dividend behind the 21 and repeat the process: 211 / 456

Moving on to step 3:
456 goes into 211 0 times with a remainder of 211.
The next digit of our result is 0. 
Result so far: 0.0
If we take 0 away from 211, we end up with 211.
Append the next digit (1) from the dividend to 211 and continue with: 2111 / 456

Let's proceed to step 4:
If we divide 2111 by 456, we get 4 and a remainder of 287.
Write down 4 as next digit of the result. 
Result so far: 4.0
The remainder is 287 after subtracting 1824 from 2111.
Fetch the next digit (1) from the dividend, attach it to 287 and continue: 2871 / 456

Step 5:
456 can be fit into 2871 6 times, resulting in a remainder of 135.
The number 6 becomes the next digit in our result. 
Result so far: 46.0
If we take 2736 away from 2871, we end up with 135.
Append the next digit (9) from the dividend to 135 and continue with: 1359 / 456

On to step 6:
1359 divided by 456 is 2 with a remainder of 447.
The next digit of our result is 2. 
Result so far: 462.0
Subtracting 912 from 1359 leaves us with 447.
Grab the next digit (8) from the dividend, add it to 447, then carry on: 4478 / 456

Step 7:
The number 456 fits into 4478 9 times, leaving a remainder of 374.
Record the quotient 9 as the next digit in the result. 
Result so far: 4629.0
Deduct 4104 from 4478 and we're left with 374.
Append the next digit (0) from the dividend to 374 and continue with: 3740 / 456

Step 8:
When dividing 3740 by 456, we get 8 with a remainder of 92.
Use 8 as the next digit of our solution. 
Result so far: 46298.0
The remainder is 92 after subtracting 3648 from 3740.
Since there are no more digits in the dividend, we add a zero to the remainder making it 920, and continue the process.

Moving on to step 9:
920 divided by 456 is 2 with a remainder of 8.
Write down 2 as next digit of the result. 
Result so far: 46298.2
The remainder is 8 after subtracting 912 from 920.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Going ahead to step 10:
456 can be fit into 80 0 times, resulting in a remainder of 80.
Write down 0 as next digit of the result. 
Result so far: 46298.2
Subtracting 0 from 80 leaves us with 80.
Since there are no more digits in the dividend, we add a zero to the remainder making it 800, and continue the process.

Let's proceed to step 11:
800 divided by 456 is 1 with a remainder of 344.
Put 1 as the next digit of the answer. 
Result so far: 46298.201
Subtracting 456 from 800 leaves us with 344.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3440, and continue the process.

Going ahead to step 12:
456 goes into 3440 7 times with a remainder of 248.
Record the quotient 7 as the next digit in the result. 
Result so far: 46298.2017
Subtracting 3192 from 3440 leaves us with 248.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2480, and continue the process.

Advancing to step 13:
The number 456 fits into 2480 5 times, leaving a remainder of 200.
The next digit of our result is 5. 
Result so far: 46298.20175
The remainder is 200 after subtracting 2280 from 2480.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2000, and continue the process.

Moving on to step 14:
456 can be fit into 2000 4 times, resulting in a remainder of 176.
The number 4 becomes the next digit in our result. 
Result so far: 46298.201754
Subtract 1824 from 2000 to get 176.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1760, and continue the process.

Moving on to step 15:
The number 456 fits into 1760 3 times, leaving a remainder of 392.
Put 3 as the next digit of the answer. 
Result so far: 46298.2017543
If we subtract 1368 from 1760, we get 392.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3920, and continue the process.

Let's proceed to step 16:
456 can be fit into 3920 8 times, resulting in a remainder of 272.
Record the quotient 8 as the next digit in the result. 
Result so far: 46298.20175438
Subtract 3648 from 3920 to get 272.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2720, and continue the process.

After the division, we end up with 46298.20175438 and a remainder of 2.72e-07.