# 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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## 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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