Multiplying by Tens

Multiplying by Tens

Read each question carefully and solve the multiplication problems. Remember to use your knowledge of multiplying by tens!

1. When you multiply a whole number by 10, you add one   to the end of the number.

2. The product of 7 and 10 is  .

3. Multiplying by 20 is the same as multiplying by 2 and then multiplying by  .

4. If you have 5 groups of 10 apples, you have a total of   apples.

1. Which of the following is equivalent to 8 x 30?

2. What is the product of 12 and 40?

1. A baker bakes 6 trays of cookies. Each tray has 10 cookies. How many cookies did the baker bake in all?

2. There are 20 students in a class. Each student has 3 books. How many books are there in total?

Use the number line to show 3 x 20. Circle the final product.

1. 9 x 10 = 90

2. To find 5 x 60, you can multiply 5 x 6 and then add two zeros.

Explain in your own words how multiplying by a multiple of ten (like 20, 30, 40) is similar to multiplying by 10.