Multiplying and dividing by 10 and 100. Before Christmas we were multiplying and dividing by 10 and 100. Have a go at these questions to refresh your memory. Remember when we multiply by 10 we move digits 1 place to the left and when we multiply by 100, we move 2 places to the left. It is the opposite for division- By 10 it is 1 place to the right. By 100, 2 places to the right. There is a place value grid to help you.