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math - standard form

posted by on .

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 don't get how to work this one out

please could you help/explain. thanks.

  • math - standard form - ,

    You did 3) wrong. Using your method..
    3)6.5x10^-3 - 3.5x10^-9
    0.006 5-0.000 000 003 5=0.0059999965
    5.9999965 x 10^-3

    Let me show you an easier way. Convert both numbers to the same power.

    6.5E-3 - 3.5E-9
    6.5E-3 - 3.5E-3E-6
    (6.5- .000 0035 )E-3
    6.499 99965 E-3

    another example
    5.2x10^6 + 3x10^5
    52.0E5+3E5
    55E5 or 5.5E6


    Lastly
    4)400/(5x10^6)
    4E2/5E6= .8E(2-6)=.8E-4=8E-5

  • math - standard form - ,

    what does E stand for?

  • math - standard form - ,

    E means x 10^ It is often used in computers, calculators, and in ASCII chat as here. It is easier.

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