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number series
Posted: Fri Apr 13, 2012 8:01 pm
by fast trak
1) 3,6,9,18,21,...?
options are
78, 56, 40, 48, 42
2) 57, 45, 36, 30, 27,...?
options
24, 38, 35, 27, 55
Thanks
Re: number series
Posted: Fri Apr 13, 2012 8:10 pm
by Sally-Anne
fast trak wrote:1) 3,6,9,18,21,...?
options are
78, 56, 40, 48, 42
x2, +3, x2, +3, ... x2 ... answer 42
2) 57, 45, 36, 30, 27,...?
options
24, 38, 35, 27, 55
-12, -9, -6, -3, ... -0 ... answer 27
(Three times table, subtract in reverse.)
Re: number series
Posted: Fri Apr 13, 2012 8:28 pm
by fast trak
thanks a lot
another one
13(18)23 29(24)19
22( ) 6
options
24, 14, 36, 12, 22
Re: number series
Posted: Fri Apr 13, 2012 8:37 pm
by Sally-Anne
Good thing I'm at a loose end tonight, isn't it?
(I shouldn't be, but I can't quite get down to the task in hand ...
fast trak wrote:13(18)23 29(24)19
22( ) 6
options
24, 14, 36, 12, 22
13 + 23 = 36 / 2 = 18
29 +19 =48 / 2 = 24
22 + 6 = 28 / 2 = 14
If the number in the middle brackets is in between those either side you are probably subtracting, or adding them and halving. (And possibly adding or subtracting a small number beyond that.)
Re: number series
Posted: Fri Apr 13, 2012 8:40 pm
by DC17C
13 +23 =36/2 =18
29+19=48/2= 24
22+6=28/2=14
Re: number series
Posted: Fri Apr 13, 2012 10:13 pm
by fast trak
thanks a ton. so many options to remember.
Re: number series
Posted: Sun Apr 15, 2012 2:17 pm
by fast trak
3(24)18 1(44)22
13( )26
Re: number series
Posted: Sun Apr 15, 2012 3:01 pm
by patricia
fast trak wrote:3(24)18 1(44)22
13( )26
18 divided by 3 = 6
How do you get to 24 = x 4 [left number plus 1]
22 divided by 1 = 22
How do you get to 44 = x 2 [left number plus 1]
26 divided by 13 = 2
2 x left number plus 1 [13 plus 1 = 14]
2 x 14 = 28
Patricia
Re: number series
Posted: Sun Apr 15, 2012 6:11 pm
by fast trak
omg this is too much
