Videos to help Grade 3 students learn how to demonstrate the commutativity of multiplication and practice related facts by skip-counting objects in array models.

Common Core Standards:3.OA.1, 3.OA.5, 3.OA.3, 3.OA.4

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Common Core For Grade 3

New York State Common Core Math Module 1, Grade 3, Lesson 7, Lesson 8

Lesson 7 Concept Development

Problem 1: Rotate arrays 90 degrees.

Problem 2: Interpreting rows and columns in rotated arrays.

Word Problem: Sara bought 2 boxes of notecards. Each box has 8 cards in it.

a) Draw an array to show the total number of cards.

b) Write a multiplication sentence that shows the total number of cards.

c) Use the commutative property to write a related multiplication sentence.

1. a. Count by twos 7 times.

_____, _____,_____,_____,_____,_____,_____

b. Draw an array that matches your count-by.

c. Write a multiplication sentence that represents the total number of objects in your array.

________ × ________ = ________

2. a. Count by sevens 2 times.

_______, _______ b. Draw an array that matches your count-by.

c. Write a multiplication sentence that represents the total number of objects in your array.

________ × ________ = ________

5. Write and solve a different multiplication sentence to describe each array.

Problem 1: Rotate arrays 90 degrees.

Problem 2: Interpreting rows and columns in rotated arrays.

Draw an array with 5 rows and 3 columns.

Draw an array with 3 rows and 5 columns.

When we turn an array 90 degrees, columns become rows and rows become columns.

Count by 4s five times.

Count by 5s four times.

Word Problem:

George puts 3 stickers on each page of his notebook. He puts stickers on 8 pages.

a) Draw an array showing the total number of stickers.

b) write a multiplication sentence to find the total number of stickers.

George adds 2 more pages, with 3 stickers on each page. Draw x's to show the new stickers on the array.

c) Write a multiplication sentence for the new total.

Lesson 8 Homework

1. a. Count by threes 6 times.

____, ____,____,____,____,____

b. Draw an array that matches your count-by.

2. a. Count by sixes 3 times.

_______, _______, _______

b. Draw an array that matches your count-by.

6. Ivania recycles. She gets 3 cents for every can she recycles.

a. How much money does Ivania make if she recycles 4 cans?

__________ × __________ = ________ cents

b. How much money does she make if she recycles 7 cans?

__________ × __________ = ________ cents

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