Intro to Multiplication

An 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?

I can make 4 rows of 8 in an array and then write the multiplication equation.
O O O O O O O O
O O O O O O O O
O O O O O O O O
O O O O O O O O
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.