number series
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number series
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
options are
78, 56, 40, 48, 42
2) 57, 45, 36, 30, 27,...?
options
24, 38, 35, 27, 55
Thanks
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- Posts: 9235
- Joined: Wed Jan 11, 2006 8:10 pm
- Location: Buckinghamshire
Re: number series
x2, +3, x2, +3, ... x2 ... answer 42fast trak wrote:1) 3,6,9,18,21,...?
options are
78, 56, 40, 48, 42
-12, -9, -6, -3, ... -0 ... answer 272) 57, 45, 36, 30, 27,...?
options
24, 38, 35, 27, 55
(Three times table, subtract in reverse.)
Re: number series
thanks a lot
another one
13(18)23 29(24)19
22( ) 6
options
24, 14, 36, 12, 22
another one
13(18)23 29(24)19
22( ) 6
options
24, 14, 36, 12, 22
-
- Posts: 9235
- Joined: Wed Jan 11, 2006 8:10 pm
- Location: Buckinghamshire
Re: number series
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 ...
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.)
13 + 23 = 36 / 2 = 18fast trak wrote:13(18)23 29(24)19
22( ) 6
options
24, 14, 36, 12, 22
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
13 +23 =36/2 =18
29+19=48/2= 24
22+6=28/2=14
29+19=48/2= 24
22+6=28/2=14
Re: number series
thanks a ton. so many options to remember.
Re: number series
18 divided by 3 = 6fast trak wrote:3(24)18 1(44)22
13( )26
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