Post a New Question

math - standard form

posted by .

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.

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. Math

    Name the property that justifies each step. [(2x100)+(3x10)]+[(1x100)+(5x10)] = (2x100)=[(3x10)+(1x100)]+(5x10) I think this is Commutative = (2x100)+[(1x100)+(3x10)]+(5x10) I think this is Distributive property =[(2x100)+(1x100)]+[(3x10)+(5x10)] …
  2. Chemistry

    In an experiment, 0.0300 moles each of SO3(g), S02(g), and O2(g) were placed in a 10.0L flask at a certain temperature. When the reaction came to equilibrium, the cocentration of SO2(g) in the flask was 3.50x10^-5 molar. What is Kc …
  3. AP Chem

    MnS(s) + 2 H+ --> Mn2+ + H2S(g) At 25 C the solubility product constant, Ksp, for MnS is 5 x 10-15 and the acid dissociation constants K1 and K2 for H2S are 1 x 10-7 and 1 x 10-13, respectively. What is the equilibrium constant …
  4. chemistry

    1. (3.0x10^4) divided by (6.2x10^1) = 5x10^2?
  5. Math; PLEASE CHECK MY ANSWERS

    1.Which of the following is greater than 4.3x10^9 A)2.1x10^9 B)3.2x10^9 C)5.3x10^9 D)7.4x10^8*** 2.Which of the following are less than 6.5x10^-5?
  6. Crystal

    So this is the problem: A comet is in an elliptical orbit around our Sun. At its point of closest approach, it is moving at 6.3x10^4 m/s and is 4.2x10^10m away from the sun. When it is at the farthest distance, 7.5x10^12m away, how …
  7. Physics

    So this is the problem: A comet is in an elliptical orbit around our Sun. At its point of closest approach, it is moving at 6.3x10^4 m/s and is 4.2x10^10m away from the sun. When it is at the farthest distance, 7.5x10^12m away, how …
  8. math , steve or damon pls

    for questions 15 and 16, multiply. write in scientific notation (9x10^4)(8x10^6) 7.2x10^25 1.7x10^11 7.2x10^11 1.7x10^25 (1.7x10^-4)(5x10^-5) 8.5x10^-9 8.5x10^20 6.7x10^-9 6.7x10^20 for 15 I'm thinking it is c and 16 could be A pls …
  9. Chemistry

    At 25°C, the methylaminium ion, CH3NH3+, has a Ka of 2.0 x 10–11. Which of the following is the pH of a 0.15 mol L–1 solution of methylamine?
  10. Math

    (6.0x10^5)x(3.0x10^4)=? 18x10^20 18x10^9 1.8x10^20 1.8x10^10 2.(5x10^-2)/(2x10^10=?

More Similar Questions

Post a New Question