Spider Sequences

6

12

18

24

a

27

61

95

129

b

20

-40

80

-160

c

4

16

64

256

d

10

9

60

90

e

 

 

 

 

Answers

a = 30  :: This sequence is the 6 times table.

b = 163  :: Add 34 to the previous number

c = 320  :: Multiply the previous number by negative two

d = 1024 :: Multiply the previous number by 4

e = 70  :: This sequence shows the largest number which can be spelled with 3 letters, 4 letters, 5 letters etc. What would be the next number in this sequence?

 

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"You say e = 70. 'Seventy' being the largest number spelt with 7 letters. What about 'hundred'?"

J Lunnon, Holgate School
Monday, March 19, 2007

 

"What about million or billion or zillion ??"

N Peters, Uplands Junior School
Wednesday, March 28, 2007

 

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