53458498 ÷ 78 
We want to figure out the number of times 53458498 can be divided by 78.

Let's proceed to step 1:
When dividing 5 by 78, we get 0 with a remainder of 5.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we subtract 0 from 5, we get 5.
Include the next digit (3) from the dividend after 5, then repeat: 53 / 78

Moving on to step 2:
78 goes into 53 0 times with a remainder of 53.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 53 leaves us with 53.
Bring next digit (4) of the dividend behind the 53 and repeat the process: 534 / 78

Advancing to step 3:
The number 78 fits into 534 6 times, leaving a remainder of 66.
The next digit of our result is 6. 
Result so far: 6.0
Subtract 468 from 534 to get 66.
Take the next digit (5) from the dividend and append it to 66, then repeat: 665 / 78

Moving on to step 4:
When dividing 665 by 78, we get 8 with a remainder of 41.
The number 8 becomes the next digit in our result. 
Result so far: 68.0
The remainder is 41 after subtracting 624 from 665.
Bring next digit (8) of the dividend behind the 41 and repeat the process: 418 / 78

Going ahead to step 5:
When dividing 418 by 78, we get 5 with a remainder of 28.
Put 5 as the next digit of the answer. 
Result so far: 685.0
If we take 390 away from 418, we end up with 28.
Grab the next digit (4) from the dividend, add it to 28, then carry on: 284 / 78

Step 6:
The number 78 fits into 284 3 times, leaving a remainder of 50.
Write down 3 as next digit of the result. 
Result so far: 6853.0
Subtracting 234 from 284 leaves us with 50.
Bring next digit (9) of the dividend behind the 50 and repeat the process: 509 / 78

Step 7:
The number 78 fits into 509 6 times, leaving a remainder of 41.
The number 6 becomes the next digit in our result. 
Result so far: 68536.0
If we subtract 468 from 509, we get 41.
Include the next digit (8) from the dividend after 41, then repeat: 418 / 78

Advancing to step 8:
78 goes into 418 5 times with a remainder of 28.
Use 5 as the next digit of our solution. 
Result so far: 685365.0
If we take 390 away from 418, we end up with 28.
Since there are no more digits in the dividend, we add a zero to the remainder making it 280, and continue the process.

Moving on to step 9:
78 can be fit into 280 3 times, resulting in a remainder of 46.
Use 3 as the next digit of our solution. 
Result so far: 685365.3
Deduct 234 from 280 and we're left with 46.
Since there are no more digits in the dividend, we add a zero to the remainder making it 460, and continue the process.

On to step 10:
If we divide 460 by 78, we get 5 and a remainder of 70.
The next digit of our result is 5. 
Result so far: 685365.35
If we subtract 390 from 460, we get 70.
Since there are no more digits in the dividend, we add a zero to the remainder making it 700, and continue the process.

Let's proceed to step 11:
78 can be fit into 700 8 times, resulting in a remainder of 76.
Record the quotient 8 as the next digit in the result. 
Result so far: 685365.358
Subtract 624 from 700 to get 76.
Since there are no more digits in the dividend, we add a zero to the remainder making it 760, and continue the process.

Let's proceed to step 12:
78 goes into 760 9 times with a remainder of 58.
Write down 9 as next digit of the result. 
Result so far: 685365.3589
If we take 702 away from 760, we end up with 58.
Since there are no more digits in the dividend, we add a zero to the remainder making it 580, and continue the process.

Step 13:
580 divided by 78 is 7 with a remainder of 34.
Put 7 as the next digit of the answer. 
Result so far: 685365.35897
The remainder is 34 after subtracting 546 from 580.
Since there are no more digits in the dividend, we add a zero to the remainder making it 340, and continue the process.

Step 14:
The number 78 fits into 340 4 times, leaving a remainder of 28.
The number 4 becomes the next digit in our result. 
Result so far: 685365.358974
Deduct 312 from 340 and we're left with 28.
Since there are no more digits in the dividend, we add a zero to the remainder making it 280, and continue the process.

Advancing to step 15:
280 divided by 78 is 3 with a remainder of 46.
Write down 3 as next digit of the result. 
Result so far: 685365.3589743
If we take 234 away from 280, we end up with 46.
Since there are no more digits in the dividend, we add a zero to the remainder making it 460, and continue the process.

Moving on to step 16:
78 can be fit into 460 5 times, resulting in a remainder of 70.
Write down 5 as next digit of the result. 
Result so far: 685365.35897435
If we take 390 away from 460, we end up with 70.
Since there are no more digits in the dividend, we add a zero to the remainder making it 700, and continue the process.

The final outcome is 685365.35897435, with a leftover of 7e-08.