Paula Said:

Im doin a worksheet on scientific notation. One section reads: Round off each number to 3 significant figures?

We Answered:

Significant figures means digits that are not zero - unless the zero is between two non-zero numbers, or at the end of a decimal.

34,000 has two SD
34,050 has 4 SD
0.0003 has only 1 SD
0.030 has 2 SD

Tommy Said:

How do you change a number into scientific notation on a calculater?

We Answered:

On a TI-34, insert:
340,000
2nd (blue horizontal bar)
(".", which has "Sci" in blue atop the "." key)
then the "=" key.

Kathleen Said:

scientific notation help?

We Answered:

Rules for Working with Significant Figures:

1. Leading zeros are never significant.
Imbedded zeros are always significant.
Trailing zeros are significant only if the decimal point is specified.
Hint: Change the number to scientific notation. It is easier to see.

2. Addition or Subtraction:
The last digit retained is set by the first doubtful digit.

3. Multiplication or Division:
The answer contains no more significant figures than the least accurately known number.

(6.79 x 10^3L) + (6.79 x 10^2L) = 7469 = 7470 with 3 sig. figs.

(5.2 x 10^5 kg) divided by (1.3 x 10^2 kg) = 4000 with only 1 sig. fig because thats all the answer will allow for.

Todd Said:

scientific notation and significant digits/figures?

We Answered:

I will do a couple for you:

1. how many picoseconds are there in 1 Ms?
picosecond = 1*10^-12 s
1 Ms = 1*10^12 s

Divide 1Ms / 1 picosecond = (1*10^12 s) / (1*10^-12 s) = 1*10^24

(notice there are no units as they canceled out.)

2. how many micrograms make 1 kg?

1 µg (microgram) = 1*10^-6 g
1 kg = 1*10^3 g

Divide 1 kg / 1 µg = (1*10^3 g) / (1*10^-6 g) = 1*10^9

4. rewrite the following quantities in scientific notation without prefixes:
--a. 3583 gigabytes
giga = 10^9
3583 gigabytes = 3583 * 10^9 = 3.583*10^12 bytes

Rosa Said:

how will i write the mathematical scientific notations (equations) in an excel worksheet?

We Answered:

If you need to enable equation editor in Excel, go to Add/Remove Programs, select MSOffice, then "Change".

Choose "Add or Remove Features", check the "Choose advanced customization of applications". Expand "Office Tools", then enable equation editor.

Open Excel, select "Tools" , "Add-ins" from the menu bar, then check the box next to equation editor.