21511800 ÷ 301 
We're looking to find how many times 301 goes into 21511800.

Going ahead to step 1:
If we divide 2 by 301, we get 0 and a remainder of 2.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we subtract 0 from 2, we get 2.
Bring next digit (1) of the dividend behind the 2 and repeat the process: 21 / 301

Advancing to step 2:
When dividing 21 by 301, we get 0 with a remainder of 21.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 21, we end up with 21.
Grab the next digit (5) from the dividend, add it to 21, then carry on: 215 / 301

Going ahead to step 3:
301 goes into 215 0 times with a remainder of 215.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 215 after subtracting 0 from 215.
Fetch the next digit (1) from the dividend, attach it to 215 and continue: 2151 / 301

On to step 4:
When dividing 2151 by 301, we get 7 with a remainder of 44.
Write down 7 as next digit of the result. 
Result so far: 7.0
If we take 2107 away from 2151, we end up with 44.
Take the next digit (1) from the dividend and append it to 44, then repeat: 441 / 301

Going ahead to step 5:
The number 301 fits into 441 1 times, leaving a remainder of 140.
Use 1 as the next digit of our solution. 
Result so far: 71.0
If we take 301 away from 441, we end up with 140.
Bring next digit (8) of the dividend behind the 140 and repeat the process: 1408 / 301

Moving on to step 6:
If we divide 1408 by 301, we get 4 and a remainder of 204.
Record the quotient 4 as the next digit in the result. 
Result so far: 714.0
If we subtract 1204 from 1408, we get 204.
Fetch the next digit (0) from the dividend, attach it to 204 and continue: 2040 / 301

On to step 7:
301 goes into 2040 6 times with a remainder of 234.
Put 6 as the next digit of the answer. 
Result so far: 7146.0
The remainder is 234 after subtracting 1806 from 2040.
Fetch the next digit (0) from the dividend, attach it to 234 and continue: 2340 / 301

Step 8:
301 can be fit into 2340 7 times, resulting in a remainder of 233.
The next digit of our result is 7. 
Result so far: 71467.0
If we take 2107 away from 2340, we end up with 233.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2330, and continue the process.

Let's proceed to step 9:
If we divide 2330 by 301, we get 7 and a remainder of 223.
Write down 7 as next digit of the result. 
Result so far: 71467.7
If we subtract 2107 from 2330, we get 223.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2230, and continue the process.

Step 10:
2230 divided by 301 is 7 with a remainder of 123.
The next digit of our result is 7. 
Result so far: 71467.77
Subtracting 2107 from 2230 leaves us with 123.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1230, and continue the process.

The final outcome is 71467.77, with a leftover of 0.123.