# Homework Help: Significant digits

1. Apr 11, 2005

### joejo

hi guys....

i'm taking an online course and i believe my work was marked wrong...

State the number of significant digits.

a) 0.0029550 m b) 7.050800 kN

can someone please tell me the # of signifcant digits!

is a) 4 or 5 and b) 5 or7

thanks guys....

2. Apr 11, 2005

### tony873004

For A, ask why they just didn't write it as 0.002955 instead of 0.0029550.
Why did they feel that it was significant to include an extra 0?

Why didn't they write 0.00295500000 ?

Same logic to part B.

Here's a nice link that explains significant digits. At the end of the page there's a link that says "practice". It gives you a sig digit quiz. But you can also type your own problems too and check if you're right.

Last edited by a moderator: Apr 21, 2017
3. Apr 11, 2005

### joejo

I know how to find it out....my teacher is denying im wrong?? please let me know which answer is right!!!

4. Apr 11, 2005

### joejo

SOMEONE please my midterm is coming up this week...i need to fix this problem

5. Apr 11, 2005

### lawtonfogle

A-5
B-7
um i got to type more stuff to post, this should be enough

6. Apr 11, 2005

### joejo

thanks alot thats what i wrote and i was getting 100% in that class but now my mark dropped!

7. Apr 11, 2005

### lawtonfogle

8. Apr 11, 2005

### lawtonfogle

from experience, DO NOT tell your teacher there wrong

find a way that will let the teacher correct the mistake themselve

9. Apr 11, 2005

### tony873004

That's very good advice! The way you phrase your complaint could mean everything, especially if your teacher has an ego.

I'd have to agree with a-5, b-7

10. Apr 11, 2005

### lawtonfogle

if you want to know, that advice comes experienced with a teacher with an ego the size of the class room, which was big