All you have to do is to reduce all numbers to 1.
Tap on the tile that is divisible by the "Next" number.
For example, 12/2=6. If you tap on 12, 6 would be set to the tile while the other remaining 6 would be listed in "Pending."
When you divide the number in a tile and the result is "1", a number from the "Pending" box (if any) would be set to the tile.
You win when all tiles numbers have been reduced to 1 and there are no more numbers in pending.
ReduceTo1 is brought to you by Bitsoftapps. Follow and like our twitter and facebook page, @Bitsoftapps.