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 Post subject: number seriesPosted: Fri Apr 13, 2012 7:01 pm

Joined: Tue Apr 10, 2012 4:24 pm
Posts: 44
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

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 Post subject: Re: number seriesPosted: Fri Apr 13, 2012 7:10 pm

Joined: Wed Jan 11, 2006 7:10 pm
Posts: 8204
Location: Buckinghamshire
fast trak wrote:
1) 3,6,9,18,21,...?

options are
78, 56, 40, 48, 42

x2, +3, x2, +3, ... x2 ... answer 42

Quote:
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.)

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 Post subject: Re: number seriesPosted: Fri Apr 13, 2012 7:28 pm

Joined: Tue Apr 10, 2012 4:24 pm
Posts: 44
thanks a lot

another one

13(18)23 29(24)19

22( ) 6

options
24, 14, 36, 12, 22

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 Post subject: Re: number seriesPosted: Fri Apr 13, 2012 7:37 pm

Joined: Wed Jan 11, 2006 7:10 pm
Posts: 8204
Location: Buckinghamshire
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.)

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 Post subject: Re: number seriesPosted: Fri Apr 13, 2012 7:40 pm

Joined: Wed Oct 12, 2011 8:34 pm
Posts: 930
13 +23 =36/2 =18
29+19=48/2= 24

22+6=28/2=14

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 Post subject: Re: number seriesPosted: Fri Apr 13, 2012 9:13 pm

Joined: Tue Apr 10, 2012 4:24 pm
Posts: 44
thanks a ton. so many options to remember.

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 Post subject: Re: number seriesPosted: Sun Apr 15, 2012 1:17 pm

Joined: Tue Apr 10, 2012 4:24 pm
Posts: 44
3(24)18 1(44)22

13( )26

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 Post subject: Re: number seriesPosted: Sun Apr 15, 2012 2:01 pm

Joined: Mon Jan 30, 2006 4:07 pm
Posts: 2660
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

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 Post subject: Re: number seriesPosted: Sun Apr 15, 2012 5:11 pm

Joined: Tue Apr 10, 2012 4:24 pm
Posts: 44
omg this is too much

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