Probably because swapping two digits causes that (times ten moves the digit one place to the left). For example if you accidentally swapped 210,00 to 120,00: 2

Probably because swapping two digits causes that (times ten moves the digit one place to the left). For example if you accidentally swapped 210,00 to 120,00: 20x10 + 10 is the correct number, 20 + 10x10 is the swapped one.