Question

what are significant digits

Answer 1

are the digits in a number starting with the first non-zero digit and ending with the last non-zero digit.

Answer 2

Divide the following measurements using correct significant digits.

544.2 in2 ÷ 0.199 in

2,700 in
2,730 in
2,735 in
2,734.7 in

Answer 3

how do u solve this

Answer 4

http://chemed.chem.purdue.edu/genchem/topicreview/bp/ch1/sigfigs.html#mult

Answer 5

We did these already. Were you able to get the last one? You left.

Answer 6

its a timed test so i didnt get it it just went off

Answer 7

Ok. Well we're not supposed to help you on tests, anyway. :/

Answer 8

theyre practice test

Answer 9

Ok, that's different. :D

Answer 10

lol ya

Answer 11

Do you still need help?

Answer 12

ya

Answer 13

because i do not understand it at all i dont even know whih is the answer at all

Answer 14

Wikipedia says, the significant figures of a number are those digits that carry meaning contributing to its precision.

Answer 15

Ha... so I was right after all.

Answer 16

That's probably actually evidence why you shouldn't totally rely on Wikipedia. Different articles can lead you to different conclusions.

Answer 17

Anyway, essentially, the number of significant digits is the number of digits that are there when you write it properly in scientific notation.

Answer 18

For example, 3600 would be \(3.6 \times 10^3\) and as such have two significant figures, the 3 and the 6.

Answer 19

ok

Answer 20

If those zeroes were significant it would be \(3.600 \times 10^3\) and it would have four. Because there are four digits.

Otherwise, extra zeroes that are not between other significant digits aren't usually significant, I guess.

Answer 21

So here's one to practice.
How many significant digits in \(6.02 \times 10^{23}\)?

Answer 22

2 right because the 0 is betweenthem

Answer 23

The zero is between them so it IS significant.

Answer 24

And usually when something is written in scientific notation like that, all digits given are significant.

Answer 25

ok so its 3

Answer 26

Right.
How about \(9.870 \times 10^6\)

Answer 27

4

Answer 28

Right.

Answer 29

But now, here's where you have to be careful.
What about 9870, all by itself, without any special notes?

Answer 30

3

Answer 31

Yes. You've got it now.

Answer 32

ok so wht about the problem Divide the following measurements using correct significant digits.

544.2 in2 ÷ 0.199 in

2,700 in
2,730 in
2,735 in
2,734.7 in

Answer 33

how do i solve this

Answer 34

You first determine the proper number of significant digits your answer should have and then pick the answer with that number.

Answer 35

lol um when u divide it just the way it is the answer is different

Answer 36

So ignore that and just use the choices they gave you. :P

Answer 37

How many sig figs in 544.2?

Answer 38

4

Answer 39

Yes. And how many in 0.199?

Answer 40

4

Answer 41

No, that initial 0 doesn't count.

Remember, think of it in scientific notation.
You'd write it as \(1.99 \times 10^{-1}\)

Answer 42

so 3

Answer 43

Correct.
The rule for multiplication and division is that the answer has as many significant figures as the least precise answer.

Answer 44

correct

Answer 45

So we need the answer with 3 significant.

Answer 46

yes we do

Answer 47

So which one is that? :D

Answer 48

B

Answer 49

Yes!

Answer 50

Great Job!

Answer 51

YES! lol

Answer 52

thnx

Answer 53

Thanks @bookworm00981 (unless you meant Starr.. in which case I agree)

Answer 54

Also great Job @SACAPUNTAS for leading @Starr_Dynasty in the right direction!!!

Answer 55

I meant both of you haha. :P

Answer 56

No Prob. Keep up the good work everyone :D