How many inches are there in 20.4cm?

Answer 1

7.87 Or 7 inches aprrox..

Answer 2

7.9 inches.An answer with eight decimal places is wrong. In science, this is called significant figures. If the question was "what is 20.00000001 cm in inches", then 7.87401575 would be the correct answer.But the question only asked what the answer was to two significant figures: 20, so the answer can only have two significant figures: 7.9.

In fact, it could be argued the question only asked what the answer was to one significant figure: what is 2 x 101 cm in inches. The answer to that would be "8 inches". And that is one significant figure if you know what I mean.

Another way to think of this is if someone said, "it's about a mile down the road", it would be wrong to translate this to "it's about 1.609344 km down the road".

Answer 3

1 inch = 2.54 centimeters

This is an exact metric conversion.

Therefore 1 cm is approximately 0.394 in.

Answer 4

2.54 cm per inch so about 8 inches.

Answer 5

about 7.9 inches

Answer 6

8

Answer 7

6