Blackline Master Grade 4
Day 32
Standard 4.NBT.5
Name:
_____________________
Multiplication Methods Homework
Use any method we learned to solve the following problems. (Expanded Notation,
Algebraic, or Area Method.) Make sure to check your work using a different
method.
1. 6 x 72 = ______
2. 39 x 7 =______
3. Benjamin has 49 stickers, Leah has 8 times as many stickers as Benjamin. How many
stickers does Leah have? Explain how you solved this problem?
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Answer Key Grade 4
Day 32
Standard 4.NBT.5
Multiplication Methods Homework
1. 6 x 72 = __432__
Methods will vary.
2. 39 x 7 =__273__
3. Benjamin has 49 stickers, Leah has 8 times as many stickers as Benjamin. How many
stickers does Leah have? Explain how you solved this problem?
49 x 8 = 392 stickers
Explanations will vary.
Exploring the Expanded Notation Method
3x26
Step 1: Set up your problem.
26= 20
+
6
26
x3
----
26= 20 + 6
3
---------------
26
x3
----
26= 20 + 6
3
--------------3 x 20 = 60
26
x3
26= 20 + 6
3
3
Step 2: Multiply the factors of the first rectangle.
26= 20
+
6
3
Step 3: Multiply the factors of the second rectangle.
26= 20
+
6
3
Step 4: Add the two factors to get your answer.
26= 20
+
6
3
----
--------------3 x 20 = 60
3 x 6 = 18
26
x3
----
26= 20 + 6
3
--------------3 x 20 = 60
3 x 6 = 18
--------------78
Exploring the Algebraic Notation Method
3x26
Step 1: Set up your problem.
26= 20
+
3 x 26= 3 x (20 + 6)
6
3
Step 2: Multiply the factors of the first rectangle.
26= 20
+
6
3 x 26 = 3 x (20 + 6)
= 60
3
Step 3: Multiply the factors of the second rectangle.
26= 20
+
6
3 x 26= 3 x (20 + 6)
= 60 + 18
3
Step 3: Add the two factors to get your answer.
26= 20
+
6
3
3 x 26= 3 x (20 + 6)
= 60 + 18
= 78