How to slove 7.8 /7800 w/out calculator?

Question

How to slove 7.8 /7800 w/out calculator?

Answer 1

First convert the denominator to a scientific notation,

7800 = 7.8 x 10^3

Then, substitute it back to the question,

7.8 / 7800

= 7.8 / (7.8 x 10^3)  <-- cancel 7.8 from both the numerator and denominator

= 1 / 10^3  

= 10^(-3)

= 0.001  

Answer 2

7.8 / 7800

You can multiply the numerator by 1000 to make it equal to the denominator.

Then you have 7800 / 7800 = 1

Since we first multiplied by 1000, now we must divide by 1000. This is the same as moving the decimal place three places to the right in our answer of 1.

1 / 1000 = 0.001

= 0.001

Answer 3

well the 7.8 and the 78 cancel eachother out and make 1.

then move the decimal over 2 places (left for division, right for multiplication)

.010