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July 2, 2015

Homework Help: math - standard form

Posted by chelsea on Thursday, September 10, 2009 at 1:33pm.

please could you check the first 2 then explain the method on the other 2

1)5.2x10^6 + 3x10^5
5200000+300000=5500000
5.5x10^6

2)4.2x10^5 + 1.28x10^6
420000+1280000=1700000
1.7x10^6

method please

3)6.5x10^-3 - 3.5x10^-9
0.065-0.000000035=0.064999965
how do you convert this number into standard form?

4)400/(5x10^6)
i dont get how to work this one out

please could you help/explain. thanks.

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