42406495 ÷ 309 
We want to divide 42406495 by 309.

On to step 1:
When dividing 4 by 309, we get 0 with a remainder of 4.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 4, we get 4.
Bring next digit (2) of the dividend behind the 4 and repeat the process: 42 / 309

Moving on to step 2:
When dividing 42 by 309, we get 0 with a remainder of 42.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 42 leaves us with 42.
Take the next digit (4) from the dividend and append it to 42, then repeat: 424 / 309

Advancing to step 3:
If we divide 424 by 309, we get 1 and a remainder of 115.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
Subtract 309 from 424 to get 115.
Bring next digit (0) of the dividend behind the 115 and repeat the process: 1150 / 309

Advancing to step 4:
309 can be fit into 1150 3 times, resulting in a remainder of 223.
Record the quotient 3 as the next digit in the result. 
Result so far: 13.0
Subtracting 927 from 1150 leaves us with 223.
Bring next digit (6) of the dividend behind the 223 and repeat the process: 2236 / 309

On to step 5:
If we divide 2236 by 309, we get 7 and a remainder of 73.
Put 7 as the next digit of the answer. 
Result so far: 137.0
Subtracting 2163 from 2236 leaves us with 73.
Grab the next digit (4) from the dividend, add it to 73, then carry on: 734 / 309

Step 6:
734 divided by 309 is 2 with a remainder of 116.
Put 2 as the next digit of the answer. 
Result so far: 1372.0
If we subtract 618 from 734, we get 116.
Append the next digit (9) from the dividend to 116 and continue with: 1169 / 309

Let's proceed to step 7:
When dividing 1169 by 309, we get 3 with a remainder of 242.
The number 3 becomes the next digit in our result. 
Result so far: 13723.0
If we subtract 927 from 1169, we get 242.
Grab the next digit (5) from the dividend, add it to 242, then carry on: 2425 / 309

Step 8:
The number 309 fits into 2425 7 times, leaving a remainder of 262.
Use 7 as the next digit of our solution. 
Result so far: 137237.0
Deduct 2163 from 2425 and we're left with 262.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2620, and continue the process.

Step 9:
When dividing 2620 by 309, we get 8 with a remainder of 148.
The number 8 becomes the next digit in our result. 
Result so far: 137237.8
Subtracting 2472 from 2620 leaves us with 148.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1480, and continue the process.

Let's proceed to step 10:
309 can be fit into 1480 4 times, resulting in a remainder of 244.
Put 4 as the next digit of the answer. 
Result so far: 137237.84
If we take 1236 away from 1480, we end up with 244.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2440, and continue the process.

Going ahead to step 11:
When dividing 2440 by 309, we get 7 with a remainder of 277.
The number 7 becomes the next digit in our result. 
Result so far: 137237.847
The remainder is 277 after subtracting 2163 from 2440.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2770, and continue the process.

Step 12:
When dividing 2770 by 309, we get 8 with a remainder of 298.
Use 8 as the next digit of our solution. 
Result so far: 137237.8478
Deduct 2472 from 2770 and we're left with 298.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2980, and continue the process.

Let's proceed to step 13:
2980 divided by 309 is 9 with a remainder of 199.
Use 9 as the next digit of our solution. 
Result so far: 137237.84789
Subtract 2781 from 2980 to get 199.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1990, and continue the process.

Step 14:
The number 309 fits into 1990 6 times, leaving a remainder of 136.
Use 6 as the next digit of our solution. 
Result so far: 137237.847896
The remainder is 136 after subtracting 1854 from 1990.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1360, and continue the process.

Advancing to step 15:
1360 divided by 309 is 4 with a remainder of 124.
Put 4 as the next digit of the answer. 
Result so far: 137237.8478964
Subtract 1236 from 1360 to get 124.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1240, and continue the process.

Step 16:
309 can be fit into 1240 4 times, resulting in a remainder of 4.
The number 4 becomes the next digit in our result. 
Result so far: 137237.84789644
Subtracting 1236 from 1240 leaves us with 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

In conclusion, the division gives 137237.84789644 with a balance of 4e-09.