# Significant Numbers and Scientific Notation Help!

• Sep 23rd 2010, 08:43 AM
Danny299
Significant Numbers and Scientific Notation Help!
Hello new here and to maths! haha sorry if this is the wrong place I hope it is! So here is the random number equation that I came up with first one is Significant Numbers.

7.6132 x 3.42 = 26.1

This one is Scientific Notation

7.345 x 10^3 ÷ 3.33 10^2 = 2.21 x 10^1

Hope they are right if not can you tell me where you think I went wrong? Also I can write how I worked it out if needed.

In Scientific Notation how do we know what the 10^something will be?

Thanks again!
And if it is the wrong place I am sorry!!!! (Doh)
• Sep 23rd 2010, 09:21 AM
Ackbeet
For the first problem, you rounded incorrectly. The answer should be 26.0. The second answer is correct. In scientific notation, you always adjust the power of ten so that there is only one nonzero digit to the left of the decimal place.
• Sep 23rd 2010, 09:25 AM
Danny299
Ok thank so much not sure how I go the first one wrong I will go over it again when I get back thank you!
• Sep 27th 2010, 03:10 AM
Ackbeet
Did you get everything correct?