# Multiplication Facts - Array Model

Video solutions to help Grade 3 students learn how to find related multiplication facts by adding and subtracting equal groups in array models. Associative Property.

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 9

### NYS Math Module 1 Grade 4 Lesson 9 Concept Development

Problem 1: Add 2 known smaller facts to solve an unknown larger fact.

Problem 2: Subtract 2 known smaller facts to solve an unknown larger fact.

Word Problem:

Leah puts 5 rows of 4 on the table. Draw an array to show this.

She adds two more rows. Show Leah's new stickers on the array. Write a multiplication sentence to show the number of stickers added.

How do we add the totals to find Leah's total number of stickers altogether?

### NYS Math Module 1 Grade 4 Lesson 9 Homework

1. Dan organizes his star stickers into 3 rows of 4. Irene adds 2 more rows of stickers. Complete the
number sentences to describe the total number of stickers in the array.

a. (4 + 4 + 4) + (4 + 4) = ___________

b. 3 fours + ______ fours = ___________ fours

c. ________ × 5 = ____________

2. 7 × 2 = ______

12 + 2 = _______

______ × 2 = 14

3. 9 × 3 = ______

30 – ____= 27

____ × 3 = 27

4. Franklin collects stickers. He organizes his stickers in 5 rows of 4 on his table.

Draw an array that represents Franklin’s stickers using an x to show each sticker.

5 × 4 = ______

5. Franklin adds 2 more rows. Use circles to show his new stickers on the array in part 3a.

a. Write and solve a multiplication sentence to represent the circles you added to the array.

____ × 4 = ____

b. Complete the addition sentence to show how you added the totals of 2 multiplication facts to find
Franklin’s total number of stickers.

____ + ____ = 28

c. Complete the unknown to show Franklin’s total number of stickers.

____ × 4 = 28

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