Multiplication and Division with Significant Zeros (1.5)

Now that we know when zeros are significant or not, we'll do multiplication and division and rounding with numbers that have zeros.

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[danielladilly]

i think you forgot a rule, when you only round the number if its greater than 5 howevr if the front number is an even number you dont round you leave it the same

if it was an odd one then you would round it

eg

7.85

since 8 is even we just leave it the same cuse it even

so answer would be 7.8 not 7.9

[tdewitt451]

@danielladilly no, i intentionally left that rule out because i hate it, and it's mathematically incorrect. i know that some teachers like to use it, but it was designed for accounting (like rounding numbers in a bank account), NOT for scientific measurements. so if you already know the rule, great! but i'm not trying to teach it here.

[love4noreason]

for the last problem

0.03010 x 5030 = 151.403

can the answer also be 151. (a 151 with a decimal at the end)?

[tdewitt451]

@love4noreason usually you only put a decimal place for a number that has zeros at the end, like 230. or 4500. to show that those zeros are significant. if you have 151, since there aren't any zeros, you know that all three digits are significant. but if the answer were 150, and you wanted to show that all three digits (including the zero) were significant, then you'd put the decimal at the end. does that make sense?

[tazzenders]

YOU SAVED MY LIFE. NOW I'LL ACE THE QUIZ!

[Arenicolous]

Thanks. My teacher can't speak English so this helps a lot.

[md278]

Thanks so much m8!

[mggomes01]

wish my teacher taught as good...haha thanks alot

[wrinklebulhata1]

I wish you were my professor.....perfect explanations

[mloda012808]

Thank you, this is great!!!

[fancey250]

fucking love it .....more vids please

[nicanena07]

@nick42701 im in the same scenario with my professor too! lol

[nicanena07]

OMG you saved me from failing my chem test! YOU explain this soo much more simpler! THANKK YOU!

[xxxeurasiaxxx]

I can't thank you enough!

[nick42701]

My first 2 weeks of general chemistry, and our professor is still trying teach the class the concept of sigfigs and how to add/subtract, multiply and divide them, and you just taught me in 4 minutes. Maybe some of these college professors should take some pointers from you guys teaching these things on youtube. Once you grasp this concept, it's so simple. A lot of my professors have a tendency to over complicate them, making it hard to learn for everyone. Thank you for the videos.