We're dividing 87389142 by 16 
We want to figure out the number of times 87389142 can be divided by 16.

Step 1:
When dividing 8 by 16, we get 0 with a remainder of 8.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we take 0 away from 8, we end up with 8.
Take the next digit (7) from the dividend and append it to 8, then repeat: 87 / 16

Going ahead to step 2:
The number 16 fits into 87 5 times, leaving a remainder of 7.
Write down 5 as next digit of the result. 
Result so far: 5.0
Subtract 80 from 87 to get 7.
Fetch the next digit (3) from the dividend, attach it to 7 and continue: 73 / 16

Let's proceed to step 3:
If we divide 73 by 16, we get 4 and a remainder of 9.
Record the quotient 4 as the next digit in the result. 
Result so far: 54.0
Subtracting 64 from 73 leaves us with 9.
Grab the next digit (8) from the dividend, add it to 9, then carry on: 98 / 16

Advancing to step 4:
The number 16 fits into 98 6 times, leaving a remainder of 2.
Use 6 as the next digit of our solution. 
Result so far: 546.0
If we subtract 96 from 98, we get 2.
Grab the next digit (9) from the dividend, add it to 2, then carry on: 29 / 16

Moving on to step 5:
When dividing 29 by 16, we get 1 with a remainder of 13.
Record the quotient 1 as the next digit in the result. 
Result so far: 5461.0
The remainder is 13 after subtracting 16 from 29.
Fetch the next digit (1) from the dividend, attach it to 13 and continue: 131 / 16

Advancing to step 6:
16 goes into 131 8 times with a remainder of 3.
Write down 8 as next digit of the result. 
Result so far: 54618.0
Deduct 128 from 131 and we're left with 3.
Take the next digit (4) from the dividend and append it to 3, then repeat: 34 / 16

Let's proceed to step 7:
16 goes into 34 2 times with a remainder of 2.
The number 2 becomes the next digit in our result. 
Result so far: 546182.0
If we take 32 away from 34, we end up with 2.
Take the next digit (2) from the dividend and append it to 2, then repeat: 22 / 16

Advancing to step 8:
When dividing 22 by 16, we get 1 with a remainder of 6.
Write down 1 as next digit of the result. 
Result so far: 5461821.0
Subtracting 16 from 22 leaves us with 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Advancing to step 9:
16 goes into 60 3 times with a remainder of 12.
Put 3 as the next digit of the answer. 
Result so far: 5461821.3
If we subtract 48 from 60, we get 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Step 10:
16 can be fit into 120 7 times, resulting in a remainder of 8.
Record the quotient 7 as the next digit in the result. 
Result so far: 5461821.37
Deduct 112 from 120 and we're left with 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Step 11:
80 divided by 16 is 5 with a remainder of 0.
Put 5 as the next digit of the answer. 
Result so far: 5461821.375
If we subtract 80 from 80, we get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Advancing to step 12:
The number 16 fits into 0 0 times, leaving a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 5461821.375
Subtract 0 from 0 to get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Moving on to step 13:
If we divide 0 by 16, we get 0 and a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 5461821.375
If we take 0 away from 0, we end up with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Our division results in 5461821.375 with a remaining 0.0.