Scientific notation?

2008-07-22 11:06 am

We have this homework in Math about scientific notation and changing it to decimal form and I'm not that sure with some of my answers so please tell me if my answers are right tnx!!!!

Scientific notation:
-285 = -2.85 x 10^2
-742.4 = 742.4 x 10^3

Decimal form:
7.00 x10^0 = 7001
4.01 x 10^-1= 0.401
9.07 x 10^-2= 0.0907

回答 (5)

An ESL Learner

2008-07-22 11:46 am

✔ 最佳答案

1)
-285
= -2.85 x 100
= -2.85 x 10^2

2)
-742.4
= -7.424 x 100
= -7.424 x 10^2

3)
7 x 10^0
= 7 x 1
= 7

4)
4.01 x 10^-1
= 4.01 x 1/10
= 4.01/10
= 0.401

5)
9.07 x 10^-2
= 9.07 x 1/10^2
= 9.07 x 1/100
= 9.07/100
= 0.0907

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[匿名]

2008-07-22 6:27 pm

Scientific notation:
-285 -------- divide and multiply by 100 to keep the value same as – 285
= 285/100 Ã 100
= -2.85 Ã 100 = - 2.85 Ã 10Â²

-742.4
= -7424/10 ---------- divide by 1000 and multiply by 1000
= -7424/10000 Ã 1000
= -7.424 Ã 100
= -7.424 Ã 10Â²

= 742.4 x 10^3 --------- wrong

Decimal form:
7.00 x10^0
= 7 Ã 1 = 7
= 7001--------- wrong

4.01 x 10^-1
= 4.01/10 = 401/1000 = 0.401
= 0.401 ----------- correct

9.07 x 10^-2
= 9.07/100
= 907/1000
= 0.0907 ---------- correct
--------

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[匿名]

2008-07-22 6:18 pm

Scientific notion: both are wrong;
decmal form all the three are wrong .

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