21240589 divided by 78 
We're looking to find how many times 78 goes into 21240589.

Step 1:
When dividing 2 by 78, we get 0 with a remainder of 2.
Record the quotient 0 as the next digit in the 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 / 78

Advancing to step 2:
21 divided by 78 is 0 with a remainder of 21.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 21, we end up with 21.
Include the next digit (2) from the dividend after 21, then repeat: 212 / 78

Let's proceed to step 3:
78 goes into 212 2 times with a remainder of 56.
Use 2 as the next digit of our solution. 
Result so far: 2.0
The remainder is 56 after subtracting 156 from 212.
Take the next digit (4) from the dividend and append it to 56, then repeat: 564 / 78

Advancing to step 4:
78 can be fit into 564 7 times, resulting in a remainder of 18.
The next digit of our result is 7. 
Result so far: 27.0
Subtract 546 from 564 to get 18.
Take the next digit (0) from the dividend and append it to 18, then repeat: 180 / 78

Let's proceed to step 5:
78 goes into 180 2 times with a remainder of 24.
Put 2 as the next digit of the answer. 
Result so far: 272.0
The remainder is 24 after subtracting 156 from 180.
Append the next digit (5) from the dividend to 24 and continue with: 245 / 78

Advancing to step 6:
If we divide 245 by 78, we get 3 and a remainder of 11.
Record the quotient 3 as the next digit in the result. 
Result so far: 2723.0
The remainder is 11 after subtracting 234 from 245.
Fetch the next digit (8) from the dividend, attach it to 11 and continue: 118 / 78

Let's proceed to step 7:
78 can be fit into 118 1 times, resulting in a remainder of 40.
The next digit of our result is 1. 
Result so far: 27231.0
Deduct 78 from 118 and we're left with 40.
Grab the next digit (9) from the dividend, add it to 40, then carry on: 409 / 78

Going ahead to step 8:
When dividing 409 by 78, we get 5 with a remainder of 19.
Record the quotient 5 as the next digit in the result. 
Result so far: 272315.0
Subtracting 390 from 409 leaves us with 19.
Since there are no more digits in the dividend, we add a zero to the remainder making it 190, and continue the process.

Moving on to step 9:
190 divided by 78 is 2 with a remainder of 34.
Record the quotient 2 as the next digit in the result. 
Result so far: 272315.2
The remainder is 34 after subtracting 156 from 190.
Since there are no more digits in the dividend, we add a zero to the remainder making it 340, and continue the process.

Going ahead to step 10:
When dividing 340 by 78, we get 4 with a remainder of 28.
Write down 4 as next digit of the result. 
Result so far: 272315.24
If we take 312 away from 340, 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.

Going ahead to step 11:
280 divided by 78 is 3 with a remainder of 46.
Write down 3 as next digit of the result. 
Result so far: 272315.243
Subtracting 234 from 280 leaves us 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.

Going ahead to step 12:
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: 272315.2435
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 13:
When dividing 700 by 78, we get 8 with a remainder of 76.
Record the quotient 8 as the next digit in the result. 
Result so far: 272315.24358
If we take 624 away from 700, we end up with 76.
Since there are no more digits in the dividend, we add a zero to the remainder making it 760, and continue the process.

Moving on to step 14:
760 divided by 78 is 9 with a remainder of 58.
The next digit of our result is 9. 
Result so far: 272315.243589
Subtract 702 from 760 to get 58.
Since there are no more digits in the dividend, we add a zero to the remainder making it 580, and continue the process.

Going ahead to step 15:
78 goes into 580 7 times with a remainder of 34.
The next digit of our result is 7. 
Result so far: 272315.2435897
If we take 546 away from 580, we end up with 34.
Since there are no more digits in the dividend, we add a zero to the remainder making it 340, and continue the process.

On to step 16:
340 divided by 78 is 4 with a remainder of 28.
Use 4 as the next digit of our solution. 
Result so far: 272315.24358974
Subtract 312 from 340 to get 28.
Since there are no more digits in the dividend, we add a zero to the remainder making it 280, and continue the process.

Our division results in 272315.24358974 with a remaining 2.8e-08.