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### Course: 3rd grade (Eureka Math/EngageNY)>Unit 1

Lesson 1: Topic A: Multiplication and the meaning of the factors

# Introduction to multiplication

Let's dive into the concept of multiplication using the example of a squirrel collecting acorns. Together, we'll see that multiplication is all about adding equal groups together. We'll find that 5 groups of 3 acorns each can be represented as 5 times 3, which equals 15 acorns.

## Want to join the conversation?

• Is it hard to multiply with decimals?
• why do you need to say 3+3+3+3+3 instead of counting in 3s
• It's just a clear way to show it, to make sure that you understand that multiplication is really repeated addition (2+2+2, or something)
• I don't understand why you say 5 threes, can you explain that for me?
• The squirrel has collected 3 acorns every day for 5 days, so there are 5 groups of acorns with 3 acorns in each group.

If you wanted to find the total number of acorns, that is 3 x 5 or 3 + 3 + 3 + 3 + 3 = 15
• If you were to make it five groups every day how many would there be?
• If there were 5 acorns collected every day, then there would be 5 groups of 5.

The total number of acorns would be 5 x 5 = 5 + 5 + 5 + 5 + 5 = 25.
• Is division and multiplication the same thing?
• Division is the opposite of multiplication, so they are related.
• why did they make the multiplication symbol × ?
• Maybe because the addition is close to multiplication but since it can't be the same
they fliped it so it would look like this x.
• is there history behind the multiplication symbol ?