How do I make a ten to find the sum

Meaning 10 times 4 witch equals 40

pretty much adding a zero at the end of any number

Use strategies such as counting on; making ten (e. g., 8 + 6 = 8 + 2 + 4 = 10 + 4 = 14); decomposing a number leading to a ten (e. g., 13 - 4 = 13 - 3 - 1 = 10 - 1 = 9); using the relationship between addition and subtraction (e. g., knowing that 8 + 4 = 12, one knows 12 - 8 = 4); and creating equivalent but easier or ...