Looks cool

Will have a looksee.
I'm pretty sure that it's worth more than a buck. I can't believe the high value of a buck nowadays when considering software. Used to be we'd spend much more than that without thinking and if it was crap, we'd just move onto the next title. Seems like devs now have to justify every single cent and then some to get a sale. You can just about get a bar of chocolate for a dollar now, and users want brilliant graphics, brilliant sound, hours and hours (years if possible) of gameplay, internet/social interaction and global high-scores. A sad state of affairs

[EDIT] Now played. that's really good fun:) It gave me a run for my money (well, nearly!).
The only problem I can see is that I had the same questions asked several times within a very short play.
I think the title is a little misleading too - MathFrog(s)/FroggyMaths might make more sense (1x1 kind of sounds as though it's a solo game).
The frog jump sounds are very loud and annoying, although necessary and important. A tune would definitely be welcomed (Two Little Speckled Frogs or something similar) as it would tone down the sfx.
What I would do also, is add a bug/fly that appears at the right answer if the player takes too long to answer a question - this would make it easier for younger players to learn maths, and prevent them turning off as they start losing due to being stuck. I would also include PLUS and MINUS operators (don't worry about divide just yet). The TOTAL SCORE required also seems a bit small and too close to the lower lily-pads.
But this really is a lovely game.

In case you are still worried about your suggested price-point - check this out:
http://itunes.apple.com/app/jewel-picker/id446961919?mt=8 