math  standard form
posted by chelsea .
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
0.0650.000000035=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.

You did 3) wrong. Using your method..
3)6.5x10^3  3.5x10^9
0.006 50.000 000 003 5=0.0059999965
5.9999965 x 10^3
Let me show you an easier way. Convert both numbers to the same power.
6.5E3  3.5E9
6.5E3  3.5E3E6
(6.5 .000 0035 )E3
6.499 99965 E3
another example
5.2x10^6 + 3x10^5
52.0E5+3E5
55E5 or 5.5E6
Lastly
4)400/(5x10^6)
4E2/5E6= .8E(26)=.8E4=8E5 
what does E stand for?

E means x 10^ It is often used in computers, calculators, and in ASCII chat as here. It is easier.
Respond to this Question
Similar Questions

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)] … 
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 … 
AP Chem
MnS(s) + 2 H+ > Mn2+ + H2S(g) At 25 C the solubility product constant, Ksp, for MnS is 5 x 1015 and the acid dissociation constants K1 and K2 for H2S are 1 x 107 and 1 x 1013, respectively. What is the equilibrium constant … 
chemistry
1. (3.0x10^4) divided by (6.2x10^1) = 5x10^2? 
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? 
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 … 
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 … 
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 … 
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? 
Math
(6.0x10^5)x(3.0x10^4)=? 18x10^20 18x10^9 1.8x10^20 1.8x10^10 2.(5x10^2)/(2x10^10=?