Question

Subtract the following measurements using correct significant digits.

67.0 mi - 1.83 mi

65.17 mi
65.2 mi
65 mi
70 mi

Answer 1

do i just subract like normal

Answer 2

Yes...but your answer should have the same number of significant digits as the number with the least number of significant digits between those you are subtracting.

Answer 3

65.17 is my answer if u just subtract normal

Answer 4

You've only got one decimal place in the 67.0, so you have to round that to 65.2

Answer 5

that has 4 significant digits. how many significant digits do 67.0 and 1.83 each have?

Answer 6

3 right

Answer 7

yes.

Answer 8

ok so does tht mean the answer is B because of 3 digits

Answer 9

yes

Answer 10

65.17

Answer 11

ok so its 65.2

Answer 12

Hmm, ok. I knew there was a little bit of a trick.
http://sigfigscalculator.appspot.com/tutorial/add_and_subtract
So for addition and subtraction it's actually based on decimal places, not number of total sig figs, but in this case it doesn't matter.

Answer 13

yes

Answer 14

so its right to say B 65.2

Answer 15

Yes