We look at the division of 21351749 by 386 
We're looking to find how many times 386 goes into 21351749.

Step 1:
When dividing 2 by 386, we get 0 with a remainder of 2.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 2 leaves us with 2.
Grab the next digit (1) from the dividend, add it to 2, then carry on: 21 / 386

On to step 2:
386 can be fit into 21 0 times, resulting in 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.
Fetch the next digit (3) from the dividend, attach it to 21 and continue: 213 / 386

On to step 3:
The number 386 fits into 213 0 times, leaving a remainder of 213.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 213 and we're left with 213.
Bring next digit (5) of the dividend behind the 213 and repeat the process: 2135 / 386

Moving on to step 4:
When dividing 2135 by 386, we get 5 with a remainder of 205.
The number 5 becomes the next digit in our result. 
Result so far: 5.0
Subtract 1930 from 2135 to get 205.
Include the next digit (1) from the dividend after 205, then repeat: 2051 / 386

Advancing to step 5:
The number 386 fits into 2051 5 times, leaving a remainder of 121.
Put 5 as the next digit of the answer. 
Result so far: 55.0
Deduct 1930 from 2051 and we're left with 121.
Grab the next digit (7) from the dividend, add it to 121, then carry on: 1217 / 386

Moving on to step 6:
The number 386 fits into 1217 3 times, leaving a remainder of 59.
Record the quotient 3 as the next digit in the result. 
Result so far: 553.0
The remainder is 59 after subtracting 1158 from 1217.
Include the next digit (4) from the dividend after 59, then repeat: 594 / 386

Going ahead to step 7:
594 divided by 386 is 1 with a remainder of 208.
Put 1 as the next digit of the answer. 
Result so far: 5531.0
Subtract 386 from 594 to get 208.
Grab the next digit (9) from the dividend, add it to 208, then carry on: 2089 / 386

Moving on to step 8:
386 can be fit into 2089 5 times, resulting in a remainder of 159.
The number 5 becomes the next digit in our result. 
Result so far: 55315.0
The remainder is 159 after subtracting 1930 from 2089.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1590, and continue the process.

On to step 9:
1590 divided by 386 is 4 with a remainder of 46.
Put 4 as the next digit of the answer. 
Result so far: 55315.4
If we subtract 1544 from 1590, we get 46.
Since there are no more digits in the dividend, we add a zero to the remainder making it 460, and continue the process.

Advancing to step 10:
The number 386 fits into 460 1 times, leaving a remainder of 74.
Use 1 as the next digit of our solution. 
Result so far: 55315.41
Subtract 386 from 460 to get 74.
Since there are no more digits in the dividend, we add a zero to the remainder making it 740, and continue the process.

Step 11:
When dividing 740 by 386, we get 1 with a remainder of 354.
Use 1 as the next digit of our solution. 
Result so far: 55315.411
Subtracting 386 from 740 leaves us with 354.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3540, and continue the process.

After the division, we end up with 55315.411 and a remainder of 0.0354.