Moltiplicatore in colonna is a free Android application developed by SCUOLA ELETTRICA that helps students perform multiplication and division operations in a traditional way, as if they were using pen and paper. The app allows users to enter the multiplicand and multiplier in separate rows, separated by an "x" symbol, and then draw a horizontal line to perform the multiplication. The same column system is also used for dividing two numbers, even decimals. The app also provides a quick and easy way to perform square roots, avoiding complicated and error-prone manual calculations. This educational tool is handy for students who want to double-check their math homework and improve their multiplication and division skills.