Add to Multiply

Here are the new third graders! The students are drawing pictures to show what they did over the summer. They need your help multiplying the things they drew!

We will use repeated addition and multiplication pictures to multiply. We can find the repeated addition sentence using the picture. Then we can find the multiplication sentence. Both number sentences should give us the correct answer! Are you ready to meet the third graders?

This is Caleb! He read so many books this summer! Here is a multiplication picture that represents the books Caleb drew. How many groups are there, and how many are in each group?

There are 3 groups and 3 in each group. That’s because there are 3 red circles and 3 dots in each circle. Now we need to write number sentences. What repeated addition sentence can we write from this picture?

3 plus 3 plus 3! We need 3 addends because there are 3 groups. 3 is the repeated addend because there are 3 in each group.

We need a multiplication sentence too! You can use the repeated addition sentence to write the multiplication sentence.

3 times 3! 3 is the first factor and tells us the number of addends, or groups. 3 is the second factor and tells us the addend that is repeated, or the number in each group. Let’s find out how many books Caleb drew. Start with the repeated addition sentence.

9! 3 plus 3 equals 6. 6 plus 3 equals 9. What is 3 times 3?

9! There are 9 books in Caleb’s drawing.

This is Ava, and this is Logan! They took a swimming class together this summer! Here is a multiplication picture that represents the swimming kids they drew. How many groups are there, and how many are in each group?

There are 4 groups and 3 in each group. What repeated addition sentence can we use to find the answer?

3 plus 3 plus 3 plus 3! What about a multiplication sentence?

4 times 3!

Now we can find out how many kids Ava and Logan drew. Start with the repeated addition sentence.

12! 3 plus 3 equals 6. 6 plus 3 equals 9. 9 plus 3 equals 12. What is 4 times 3?

12! There are 12 kids swimming in Ava and Logan’s drawing.

This is Daniel, and this is Zoe! They built robots this summer! Here is a multiplication picture that represents the robots they drew. How many groups are there, and how many are in each group?

There are 4 groups and 4 in each group! What number sentences can we use to find the answer?

4 plus 4 plus 4 plus 4, and 4 times 4!

Now we can find out how many robots Daniel and Zoe drew.

16! 4 plus 4 equals 8. 8 plus 4 equals 12. 12 plus 4 equals 16. 4 times 4 also equals 16. There are 16 robots in Daniel and Zoe’s drawing.

It was so much fun learning about the third graders and what they did over the summer! You did a great job using multiplication pictures to add and multiply!