Multiplying Whole Numbers and Decimals
Multiplying by 0.1, 0.01, and 0.001
Multiplying Decimals by Decimals
Modeling Multiplication of Decimals
Word Problems
100
What is the product of 5 x 0.3?
1.5
100
Is this statement true or false and why?
4 x 0.7 = 28
False - the correct answer would be
4 x 0.7 = 2.8
100
0.4 x 0.7 = ?
0.28
100
What multiplication equation does this model represent?
It represents 0.4 x 0.7 = 0.28.
(or 0.7 x 0.4 = 0.28)
100
Robert built a snowman that was 3.7 feet tall. His brother Joey built a snowman that was 1.23 times as tall as Robert's snowman. How tall is Joey's snowman?
3.7 x 1.23 = 4.551
Joey's snowman is 4.551 feet tall.
200
What is the product of 3 x 16.78?
50.34
200
Fill in the blank to make the equation true:
3 x 0.7 = 3 x 7 x _____
3 x 0.7 = 3 x 7 x 0.1
200
1.6 x 0.3 = ?
0.48
200
What multiplication equation does this model show?
It shows 0.7 x 0.6 = 0.42.
(or 0.6 x 0.7 = 0.42)
200
In March, 7.8 inches of rain fell in Redmond. In April, 2.05 times as much rain fell as in March. How many inches of rain fell in Redmond in April?
7.8 x 2.05 = 15.99
15.99 inches of rain fell in April.
300
What is the product of 22.18 x 4?
88.72
300
Find the value of (3 x 12) x 0.01
Explain or show your reasoning.
(3 x 12) x 0.01
= 36 x 0.01
= 0.36
Since there are 2 decimal places in the factors, there needs to be 2 decimal places in the product.
300
2.4 x 5.3 = ?
12.72
300
What multiplication equation does this model represent?
It represents 0.8 x 0.8 = 0.64.
300
Susie picked 5.39 pounds of blueberries. She used 0.3 of these blueberries to bake a pie. How many pounds of blueberries did Susie use to bake her blueberry pie?
5.39 x 0.3 = 1.617
She used 1.617 pounds of blueberries in her pie.
400
What is the product of 6 x 8.23?
49.38
400
Fill in the blank to make the equation true:
5 x _____ = (5 x 4) x 0.1
5 x 0.4 = (5 x 4) x 0.1
400
27.18 x 0.6 = ?
16.308
400
What multiplication equation is shown in the model?
The model shows 1.3 x 0.4 = 0.52.
(or 0.4 x 1.3 = 0.52)
400
One dozen of Katie's favorite flowers cost $10.48. If she bought 3.5 dozen of her favorite flowers, how much did Katie spend?
3.5 x 10.48 = 36.68
Katie spent $36.68 on flowers.
500
What is the product of 15.59 x 5?
77.95
500
Decide if each statement is true or false. Be prepared to justify your reasoning.
30 x 2 x 10 = 6 x 10
30 x 2 x 10 = 20 x 3 x 10
60 x 10 = 30 x 20
30 x 2 x 10 = 6 x 10 - False
30 x 2 x 10 = 20 x 3 x 10 - True
60 x 10 = 30 x 20 - True
500
14.3 x 7.75 = ?
110.825
500
What multiplication equation does this diagram represent?
The diagram represents 1.8 x 0.6 = 1.08.
(or 0.6 x 1.8 = 1.08)
500
Emma and Julian are twins. Emma is 62.4 inches tall. Julian is 0.9 times the height of Emma. How tall is Julian?
62.4 x 0.9 = 56.16
Julian is 56.16 inches tall.