76644257 ÷ 45 
We're looking to find how many times 45 goes into 76644257.

Step 1:
When dividing 7 by 45, we get 0 with a remainder of 7.
The next digit of our result is 0. 
Result so far: 0.0
Subtract 0 from 7 to get 7.
Bring next digit (6) of the dividend behind the 7 and repeat the process: 76 / 45

On to step 2:
If we divide 76 by 45, we get 1 and a remainder of 31.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
Deduct 45 from 76 and we're left with 31.
Include the next digit (6) from the dividend after 31, then repeat: 316 / 45

Moving on to step 3:
The number 45 fits into 316 7 times, leaving a remainder of 1.
The number 7 becomes the next digit in our result. 
Result so far: 17.0
If we subtract 315 from 316, we get 1.
Include the next digit (4) from the dividend after 1, then repeat: 14 / 45

Moving on to step 4:
14 divided by 45 is 0 with a remainder of 14.
Write down 0 as next digit of the result. 
Result so far: 170.0
Deduct 0 from 14 and we're left with 14.
Include the next digit (4) from the dividend after 14, then repeat: 144 / 45

On to step 5:
45 goes into 144 3 times with a remainder of 9.
The next digit of our result is 3. 
Result so far: 1703.0
If we take 135 away from 144, we end up with 9.
Grab the next digit (2) from the dividend, add it to 9, then carry on: 92 / 45

Step 6:
45 can be fit into 92 2 times, resulting in a remainder of 2.
The number 2 becomes the next digit in our result. 
Result so far: 17032.0
The remainder is 2 after subtracting 90 from 92.
Fetch the next digit (5) from the dividend, attach it to 2 and continue: 25 / 45

On to step 7:
45 goes into 25 0 times with a remainder of 25.
The number 0 becomes the next digit in our result. 
Result so far: 170320.0
If we take 0 away from 25, we end up with 25.
Append the next digit (7) from the dividend to 25 and continue with: 257 / 45

Moving on to step 8:
When dividing 257 by 45, we get 5 with a remainder of 32.
Write down 5 as next digit of the result. 
Result so far: 1703205.0
The remainder is 32 after subtracting 225 from 257.
Since there are no more digits in the dividend, we add a zero to the remainder making it 320, and continue the process.

Going ahead to step 9:
When dividing 320 by 45, we get 7 with a remainder of 5.
Record the quotient 7 as the next digit in the result. 
Result so far: 1703205.7
Deduct 315 from 320 and we're left with 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

On to step 10:
If we divide 50 by 45, we get 1 and a remainder of 5.
Record the quotient 1 as the next digit in the result. 
Result so far: 1703205.71
If we take 45 away from 50, we end up with 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Step 11:
45 can be fit into 50 1 times, resulting in a remainder of 5.
The number 1 becomes the next digit in our result. 
Result so far: 1703205.711
Subtract 45 from 50 to get 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

After the division, we end up with 1703205.711 and a remainder of 0.0005.