Equivalent Fractions

In this link you can find interactive practice to get equivalent fractions:
http://www.shodor.org/interactivate/activities/EquivFractionFinder/

In these other links you can find further practice with fractions:
http://www.shodor.org/interactivate/activities/BoundFractionPointer/
http://www.shodor.org/interactivate/activities/EquivFractionPointer/

Factozation in Prime Numbers

In this link you can find a program that factorizes in product of prime numbers the number which you introduce:
http://www.merriampark.com/factor.htmhttp://www.merriampark.com/factor.htm