Posted by **Tori** on Thursday, January 11, 2007 at 11:43pm.

I am stuck on a couple of math problems. I need help on the following numerical patterns.

5,7,11,17,25,?,47,61

80,40,20,?,5,5/2

It looks like you add two to each increment. For example,

5 + 2 = 7.

7+4=11

11+6=17

17+8=25

25+10=35 etc.

For #2, I think each is halved.

80/2=40

40/2=20

etc.

- Math -
**Anonymous**, Thursday, April 10, 2008 at 3:49pm
80 40 20 10 5

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