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Intro to Multiplication
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What you will learn from this videoWhat you will learn
- Multiplication means adding in equal groups.
- That we can count ANYTHING by lining it up in equal rows.
- And that we can use multiplication to quickly count bottles, truck wheels, basketball points and more!
- Discussion Questions
Before Video
Display an array on the board with 6 rows and 3 squares in each row. Describe what you see on the board. What do we call something that looks like this?ANSWERAn array with 6 rows and 3 squares in each row.
Write a repeated addition sentence. 3 + 3 + 3 + 3 + 3 + 3 or 6 + 6 + 6 Find the total represented by the expression.
Add 5 four times using skip-counting to get 20.
To find how many apples arranged in an array, to find the cost of 6 books that have the same price.
Maria gives each of her 4 friends 7 stickers. How many stickers did she give to her friends in all?
After Video
How can you model 8 + 8 + 8 + 8 and write it as a multiplication equation? ANSWERI can make 4 rows of 8 in an array and then write the multiplication equation.
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4 x 8 = 32
A guitar has 6 strings. How many strings will be needed to restring 7 guitars?
Amin is not correct. The expression 4 x 3 has a value of 12. I think he added 4 and 3 instead of multiplying.
The expression 4 + 3 + 4 + 3 + 2 cannot be changed to a multiplication expression with the same value because the addends (which could represent groups of objects) are not the same. The expression 4 + 4 + 4 + 4 + 4 can be changed to a multiplication expression with the same value because all of the addends are the same. The multiplication expression is 5 x 4.
You can make an array with 7 rows and 5 counters in each row to model 7 x 5. You can make another array with 5 rows and 7 counters in each row to model 5 x 7. In both cases you will see that there are 35 counters in the array. Also, if you imagine rotating one of the arrays and putting it on top of the other array, you will see that they match exactly.
- Vocabulary
- Repeated Addition DEFINE
Repeated addition is adding the same number multiple times.
- Multiplication DEFINE
Multiplication is an operation that gives the result of combining equal groups.
- Array DEFINE
An array is an arrangement of objects in rows of equal size.
- Row DEFINE
A row is an arrangement of objects from left to right.
- Times DEFINE
Times is the way we read the multiplication sign (x) between two numbers.
- Factor DEFINE
Factors are the numbers you multiply.
- Product DEFINE
The answer to a multiplication problem is called a product.
- Multiplication Table DEFINE
A multiplication table shows all the products of multiplying a number from 0 to 10 by a number from 0 to 10.
- Repeated Addition DEFINE
- Reading Material
- Practice Word Problems
- Practice Number Problems
- Lesson Plan
- Teacher Guide