Discover the Numeric Value of Y without a Calculator - Easy Methods!

[MatheusMkalo]

Numeric value of y.

y = 2.3*10⁵+6.1*10⁶+3.2*10⁷

Without calculator, how? '-'

 

[Hurkyl]

Er, what exactly are you having trouble with? (e.g. do you know how to compute [itex]10^5[/itex]?)

 

[MatheusMkalo]

If i compute 10⁵ and others:

32000000+6100000+230000 = 38330000

But if i have 50 questions like that and 1 hour to do all the questions? '-'

Don't have a easy way?

Sorry, my english is bad.

 

[Hurkyl]

Such a test would still give you over an entire minute per problem!

If it takes you more than a minute to do a problem like this, (even without any shortcuts!) then you just need to practice.


I fully believe if you do a dozen or so practice problems, you'll start to see some short-cuts of your own -- e.g. shorthand for some parts of the numeral, or some parts of the answer you can just write down without having to do any computation at all.

I suspect these short-cuts are probably better figured out on your own than taught. e.g. I could tell you that you didn't really need to write down the last 4 0's of each number in your scratch work, but I doubt me telling you would have the same impact as you figuring a short-cut out yourself after working through enough exercises. It's almost always easier to use your own short-cut than somebody else's short-cut. (even if they are essentially the same thing)

 

[SteamKing]

Numeric value of y.

y = 2.3*10⁵+6.1*10⁶+3.2*10⁷

Without calculator, how? '-'

This can be an exercise in managing zeros:

2.3 * 10^5 = 2.3 * 10^5
6.1 * 10^6 = 61. * 10^5
3.2 * 10^7 = 320. * 10^5
Sum = 383.3 * 10^5 = 3.833 * 10^7