YJournal

I worked with courtney on my wiki.I felt okay with it.

I need help with scientific notation.

12/10/10

My Findings
When adding or subtracting numbers in scientific notation, their powers of 10 must be equal. If the powers are //not// equal, then you must first convert the numbers so that they all have the same power of 10. //Example:// (6.7 x 109) + (4.2 x 109) = (6.7 + 4.2) x 109 = 10.9 x 109 = 1.09 x 1010. (Note that the last step is necessary in order to put the answer in scientific notation.) //Example:// (4 x 108) - (3 x 106) = (4 x 108) - (0.03 x 108) = (4 - 0.03) x 108 = 3.97 x 108.