Complete: 10 times four equals what?
10 times four is the same as four times 10. So we can count in 10 four times to find the answer: 10, 20, 30, 40. 10 times four equals 40. When we multiply any number by 10, the digits in that number shift one place to the left. They become worth 10 times as much. And so four ones will shift one place and now become worth four 10s. To show that the digit shifted and that therefore it’s in a new column, we write a zero as a placeholder. So we can see we still get the same answer. 10 times four equals 40.