# What number comes next in this pattern?

Asked by AriellaCG (67 ) April 13th, 2007
1, 2, 5, 10, 4, 8, 20, 40, ___?
Observing members: 0 Composing members: 0

16
skfinkel (12611 )
explain
ben (7587 )
Yes, that looks right.
ben (7587 )
x2,x2.5,x2, divided by 2.5, x2, x2.5, x2, divided by 2.5 (16)
skfinkel (12611 )
merci.
skfinkel (12611 )
Another way of looking at it is two intermittent tracks of double numbers, track 1 starting at 1 and track 2 starting at 5... every track double each time, and every two you switch tracks...
ben (7587 )
Really it's the same thing... either way you get 16
ben (7587 )
how do you get back to the beginning number?the switch tracks of each set?
skfinkel (12611 )
never mind, I see.
skfinkel (12611 )
I stared at this and thought until my brain turned to mush. Nice to see that part of the family has the math gene. Thanks for putting me out of my misery.
gailcalled (49061 )

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