Cross-multiplication - Calcula

Cross-multiplication is the kind of math that we can use in life, very versatile can be used for several things on a daily basis. For example, you can convert feet to inches, you can know if you have enough gasoline for a trip based on the number of Miles per Gallon that your car run or you can simply use it in the school... this application offers you the facility that you want and also it has a beautiful look!