AFactorTree : will do the factor tree, LCM and GCF

neat!

Have found 22 free ones from Your Teacher

These are all for the Iphone but they are working on my iPad great.

Thanks

Geometric Calculator FL free : this one lets them enter radius or diameter and/or height for A, V and circumference

MathTappers:Estimate Fractions is just want it says it is.

Pearl Diver was great for number lines includes negatives and fractions

Convert Units Free HD will let you change from one type of measure to another

Proortion Solver lets them enter 3 numbers and will compute the 4th for them.

Sorry about the typo (Proportion Solver)