mental computation for 6 x 22 x 5

[dsunflower]

I am stumped, how do I figure out the mental math for 6x22x5? Help!

 

[Deleted member 4993]

Re: mental computation

I am stumped, how do I figure out the mental math for 6x22x5? Help!

6 x 5 = 30

3 x 22 = 66

 

[dsunflower]

How about an example of a problem that could not be figured out mentally?

 

[stapel]

How about an example of a problem that could not be figured out mentally?

123593092395873209.239582367 * 39239610398573.253928702938576

But why? :?

 

[Denis]

That's easy: 48 497 447 874 363 339 710 436 026 932 120 (rounded down)
Too tired to do the portion following decimal point

 

[Loren]

11 X 30 = 330. Then double it.

 

[dsunflower]

You all are the best! Thank you so much!