Need to know vocabulary:
Multiplication as repeated addition
Multiplication is simply repeated addition. Can you add? If you can, then you can multiply. Multiplication is just adding the same numbers together multiple times. Let's look at some examples:
This number sentence is read as "three times fives." That means we are going to add the number three five times. We can write that out in an addition number sentence: 3 + 3 + 3 + 3 + 3. We know that 3 + 3 is 6, + 3 more is 9, + 3 more is 12, + 3 more is 15. So we can calculate, with repeated addition, that 3 x 5 = 15, where 3 and 5 are factors and 15 is the product.
Let's try one more example together:
Let's try one more example together:
This number sentence is read as "six times four." That tells us that we are going to add the number six four times. Again, we can write out this as an addition number sentence: 6 + 6 + 6 + 6. Then we do the addition: 6 + 6 is 12, + 6 more is 18, + 6 more is 24. Therefore, 6 x 4 = 24, where 6 and 4 are factors and 24 is the product.
Now that you have the hang of it, try one on your own:
Now that you have the hang of it, try one on your own:
Can you read this number sentence out loud? Can you write out the addition number sentence? What do you calculate the answer to be? What are the factors and product of this problem?
If you read this as "four times four," and wrote 4 + 4 + 4 + 4, got the answer 16, and said both 4s are the factors and 16 is the product, then you are correct! If you didn't get those answers don't worry! It's ok to make mistakes when learning new things, that's how you learn! Watch the first video below and see if you can find where you made your mistake.
If you read this as "four times four," and wrote 4 + 4 + 4 + 4, got the answer 16, and said both 4s are the factors and 16 is the product, then you are correct! If you didn't get those answers don't worry! It's ok to make mistakes when learning new things, that's how you learn! Watch the first video below and see if you can find where you made your mistake.
Watch the cute video below to review multiplication as repeated addition.
There are a few numbers that when you multiply by them the answer is quick to figure out. When multiplying by the number 1, you are saying that you are only adding that number 1 time, so the answer is itself. For example: 8 x 1 is read as "eight times one." That means 8 added one time, or just the number 8 by itself; 8 x 1 = 8. That works for any number, so 2 x 1 = 2, 15 x 1 = 15, and even 12,920 x 1 = 12,920. Multiplying times 1 is easy!
So is multiplying by 0. Any number times 0 is 0. That means that 3 x 0 = 0, 100 x 0 = 0, and even 3,679 x 0 = 0. It just means that you are not multiplying by anything at all.
Click the Study Jams link below to watch a quick video that will help explain multiplication as repeated addition and review the properties of one and zero as factors. Pay close attention to the vocabulary used in the video. When the video is done playing, click the video closed and try to Test Yourself by clicking on the blue button and answering the questions that follow.
Study Jams
So is multiplying by 0. Any number times 0 is 0. That means that 3 x 0 = 0, 100 x 0 = 0, and even 3,679 x 0 = 0. It just means that you are not multiplying by anything at all.
Click the Study Jams link below to watch a quick video that will help explain multiplication as repeated addition and review the properties of one and zero as factors. Pay close attention to the vocabulary used in the video. When the video is done playing, click the video closed and try to Test Yourself by clicking on the blue button and answering the questions that follow.
Study Jams
As you can see, thinking about multiplication as repeated addition will get you the correct answer. Also, another thing to note, is that you can change a repeated addition number sentence into a multiplication number sentence. Test yourself below by clicking through the number sentences. Can you write each number sentence as a multiplication and repeated addition number sentence? Can you find the correct answer to each problem?
If you still have some questions about repeated addition and multiplication, watch the video below. There are also some links to some practice games at the bottom of the page. If you think you've got the hang of it, move on to the next part!
Links to multiplication activities:
Math Magician fact practice
Multiplication.com
Skip Counting practice
Math Magician fact practice
Multiplication.com
Skip Counting practice