You explain that when you multiply a decimal number with ten, the decimal point moves one place to the right. Along with this, also explain that when you multiply by ten if you don't have a decimal point in the number, you add a zero to the number. You can see if the students have understood this by solving the problems on the interactive whiteboard together. Next you explain that when you multiply a decimal number by one hundred, the decimal point moves two places to the right. When you only have one number behind the decimal point, move the decimal point one place to the right and put a zero after the number. You can also have the students practice this by solving the problems on the interactive whiteboard. Finally you explain that when you multiply a number by one thousand, the decimal point moves three places to the right. When you only have one number behind the decimal point, you move the decimal point one place to the right and then put a zero after the number. If you have two numbers behind the decimal point, you move the decimal point two places to the right and put one zero after the number. You can also practice multiplication by one thousand by solving the problems on the interactive whiteboard together with the students. At the end of the instruction you solve two story problems together with the students, for which the students must solve the multiplication problems.

To check whether students can multiply decimal numbers with 10, 100, and 1,000, you can ask the following questions:

- What happens when you multiply a decimal number with ten/one hundred/one thousand?

- What do you do if you no longer have a decimal point in the number?

- What is the solution to the problem 53.29 x 1,000?