Main content

## 3rd grade (Eureka Math/EngageNY)

### Unit 1: Lesson 1

Topic A: Multiplication and the meaning of the factors- Equal groups
- Equal groups
- Introduction to multiplication
- Multiplication as equal groups
- Understand equal groups as multiplication
- Multiplication as repeated addition
- Relate repeated addition to multiplication
- Understand multiplication using groups of objects
- Multiply using groups of objects
- Multiplication with arrays
- Understand multiplication with arrays
- Multiply with arrays

© 2023 Khan AcademyTerms of usePrivacy PolicyCookie Notice

# Introduction to multiplication

CCSS.Math:

Sal introduces multiplication as equal groups. He relates multiplication to skip counting and repeated addition.

## Want to join the conversation?

- Is 150 divide by 0.25 equal 600(8 votes)
- Yes, because 0.25 is 1/4, and 150 divided by (1/4) = 150 x 4 = 600.

Have a blessed, wonderful day!(11 votes)

- I can't do multiplecation(8 votes)
- DONT BE DOWN ON YOURSELF! it just takes practice and hard work! you got this!(5 votes)

- what is the toltel of 9 groups of 8(4 votes)
- 9 groups of 8 are the same as
**9 x 8**.**9 x 8**is qual to**9 + 9 + 9 + 9 + 9 + 9 + 9 + 9**

That is equal to**72**.(8 votes)

- and im new from third grade in khan academy(5 votes)
- i like that very much(5 votes)

- how old is this?(5 votes)
- 00000000000000000000000000000000000000000000000000000009999999999000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000--------------------------------------------------------=======================================================666]=\(5 votes)
- Plz help me cuz me dont know what 1+1=? Me neeed help ):(3 votes)
- Solving 1+1: A Step-by-Step Guide

1+1 is a basic math problem that represents the concept of addition. Addition is a fundamental mathematical operation that combines two or more numbers together to find their sum. It is one of the first math concepts that we learn in school and is an important building block for more advanced math skills. In this article, we will go through the steps to solve 1+1 and explain why it is such a simple, yet important problem.

Step 1: Understand the problem

The first step to solving any math problem is to understand what is being asked. In this case, the problem is simply "1+1." This means that we need to add the numbers 1 and 1 together.

Step 2: Perform the addition

Now that we understand the problem, we can perform the addition. To do this, we simply need to add the two numbers together using the plus sign (+). This results in a sum of 2.

Step 3: Double-check your work

It's always a good idea to double-check your work to make sure that you haven't made any mistakes. In this case, it is easy to see that 1+1=2, so we can be confident that our answer is correct.

Why 1+1 is important

1+1 may seem like a very simple problem, but it is an important one. Understanding the concept of addition is crucial for success in math, as it lays the foundation for more advanced concepts such as algebra, geometry, and calculus. Additionally, being able to quickly and accurately solve basic math problems like 1+1 is important in everyday life, as we encounter math in a variety of situations, such as shopping, budgeting, and even cooking.

Conclusion

In conclusion, solving 1+1 is a simple process that involves understanding the problem, performing the addition, and double-checking your work. While it may seem like a trivial problem, understanding and being able to solve basic math problems like 1+1 is an important skill that will serve you well in both your academic and personal life.(3 votes)

- how do we do the 8s(4 votes)
- I do not know(1 vote)

- what is the square root of 2964?(2 votes)

## Video transcript

- [Instructor] Our
squirrel friend here likes to collect acorns, because, really, that's how he is able to live. And let's say everyday, he
collects exactly three acorns. And so what I'm curious
about is how many acorns will he have after doing
this for five days? So one way to think about
it is every day he is able to collect a group of three acorns. So you could view this
as maybe what he's able to collect in day one. And then in day two, he's
able to collect a second group of three acorns. In day three, he's able
to collect another group of three acorns. And every day it's a
equal number of acorns that he's collecting. On the fourth day, another three. On the fifth day, another three. And so if you were curious
how many total acorns he's collected, well, you
could just count them up, or you could think about, well, he's got five
groups of three acorns. Five equal groups of three acorns. So you could say five groups of three acorns, three acorns. And so the total amount would be five, we could view this as five threes. Now, five threes, you could view this as five threes added together. Three plus three, plus three,
plus three, plus three. And if you wanted to calculate this, you could skip count by three. So this would be three, six, nine, 12, 15, because we add three, we get to six, we add another three, we get to nine, we add another three, we get to 12, we add another three, we get to 15. And so this would be a way of recognizing that you have 15 acorns, but we're starting to touch
on one of the most fundamental ideas in all of mathematics. In fact, we actually are applying it, we just haven't used the world, and that's, we are multiplying. We are using multiplication. All multiplication is is this notion of multiple
equal groups of something. So, here, one way to
express what we just did, is we just, when we said five threes, that's the same thing as five, and I'm going to introduce
a new symbol to you, five times three. So all of these things are equivalent. You're already used to seeing equal groups and multiple equal groups, and you're used to adding
something multiple times, and you're used to skip counting, and all of that is, in
some way shape or form, you have been doing multiplication. So when someone says five times three, you could view that is
five groups of three, or you could view that as five threes, or you could view that
as three plus three, plus three, plus three, or you could view that as 15. I'll leave ya there. There's a lot of practice on Khan Academy to work through this and make sure you get the underlying idea. But as you'll see, this is
perhaps one of the most useful concepts that you might
learn in your entire lives.