54186149 ÷ 408 
We want to figure out the number of times 54186149 can be divided by 408.

Let's proceed to step 1:
408 goes into 5 0 times with a remainder of 5.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 5, we end up with 5.
Fetch the next digit (4) from the dividend, attach it to 5 and continue: 54 / 408

Let's proceed to step 2:
When dividing 54 by 408, we get 0 with a remainder of 54.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 54 to get 54.
Take the next digit (1) from the dividend and append it to 54, then repeat: 541 / 408

Step 3:
If we divide 541 by 408, we get 1 and a remainder of 133.
The next digit of our result is 1. 
Result so far: 1.0
Deduct 408 from 541 and we're left with 133.
Take the next digit (8) from the dividend and append it to 133, then repeat: 1338 / 408

Advancing to step 4:
408 can be fit into 1338 3 times, resulting in a remainder of 114.
The number 3 becomes the next digit in our result. 
Result so far: 13.0
If we subtract 1224 from 1338, we get 114.
Grab the next digit (6) from the dividend, add it to 114, then carry on: 1146 / 408

Step 5:
When dividing 1146 by 408, we get 2 with a remainder of 330.
The number 2 becomes the next digit in our result. 
Result so far: 132.0
Deduct 816 from 1146 and we're left with 330.
Grab the next digit (1) from the dividend, add it to 330, then carry on: 3301 / 408

Going ahead to step 6:
408 goes into 3301 8 times with a remainder of 37.
Record the quotient 8 as the next digit in the result. 
Result so far: 1328.0
If we take 3264 away from 3301, we end up with 37.
Take the next digit (4) from the dividend and append it to 37, then repeat: 374 / 408

Going ahead to step 7:
408 goes into 374 0 times with a remainder of 374.
Put 0 as the next digit of the answer. 
Result so far: 13280.0
Deduct 0 from 374 and we're left with 374.
Grab the next digit (9) from the dividend, add it to 374, then carry on: 3749 / 408

Moving on to step 8:
The number 408 fits into 3749 9 times, leaving a remainder of 77.
The next digit of our result is 9. 
Result so far: 132809.0
Subtract 3672 from 3749 to get 77.
Since there are no more digits in the dividend, we add a zero to the remainder making it 770, and continue the process.

Advancing to step 9:
408 can be fit into 770 1 times, resulting in a remainder of 362.
Write down 1 as next digit of the result. 
Result so far: 132809.1
Subtracting 408 from 770 leaves us with 362.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3620, and continue the process.

Moving on to step 10:
408 can be fit into 3620 8 times, resulting in a remainder of 356.
Record the quotient 8 as the next digit in the result. 
Result so far: 132809.18
If we take 3264 away from 3620, we end up with 356.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3560, and continue the process.

Going ahead to step 11:
408 goes into 3560 8 times with a remainder of 296.
Write down 8 as next digit of the result. 
Result so far: 132809.188
If we subtract 3264 from 3560, we get 296.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2960, and continue the process.

After the division, we end up with 132809.188 and a remainder of 0.0296.