
Multiplying Decimals
Presentation
•
Mathematics
•
4th - 6th Grade
•
Easy
+12
Standards-aligned
Selma Durakovic
Used 36+ times
FREE Resource
12 Slides • 15 Questions
1
Multiplying Decimals
Review of Module 1 Lesson 11 and 12
2
Multiplying- Key Words
Product
Times
Copies
As many as
Doubled
Tripled
Of
3
Poll
How comfortable are you with multiplying decimals?
Very Comfortable
Comfortable
Somewhat Comfortable
I do not understand how to multiply decimals.
4
When multiplying decimals the order of numbers does not matter. This is called Communicative Property of Multiplication.
5
Multiplying Decimals - Step 1
Line up the numbers. TIP- Longer number on top, smaller on bottom.
6
Step 2- Multiply
Multiply the numbers without worrying abut the decimal, just yet.
7
Step 3- Place the decimal in the correct place.
The decimal in your answer should have the same amount of numbers as in the questions.
8
Poll
Did you understand the steps to multiplying decimals?
YES
NO
9
Lets practice!
Work out each of the problems on a separate sheet of paper and choose final answer on the slide.
10
Multiple Choice
2 copies of 4 tenths
0.8
0.4
80
4
11
Multiple Choice
3 times 5 hundredths
500
1500
1.5
.15
12
Multiple Choice
Anna buys groceries for her family. Hamburger meat is $3.38 per pound, sweet potatoes are $0.79 each, and hamburger rolls are $2.30 a bag. If Anna buys 3 pounds of meat, 5 sweet potatoes, and one bag of hamburger rolls, what will she pay in all for the groceries?
$10.14
$3.95
$2.30
$16.39
13
Multiple Choice
9 times as much as 7 tenths
0.7
0.9
6.3
63
14
Poll
How are you feeling so far about multiplying decimals?
Still Confused
Frustrated
Better
Awesome
15
Let's work on estimating the products.
Remember that "Estimate" means approximate or close to. Opposite of EXACT!
16
Step 1- Look at your problem
Look at the problem you are working with.
17
Step 2. Identify your wholes
Identify the whole numbers in each or round to the nearest whole and multiply your wholes.
18
Step 3- Estimate the answer.
Once you have multiplied the wholes, estimate the total to your problem by looking at the closest number to your estimate. Ex. 24 is closest to 25.36 therefore, 25.36 is the actual answer to this problem.
19
Let's practice!
Work out the problems on a separate sheet of paper and choose your final answer on the slide.
20
Open Ended
In 2.1 x 3, what two numbers represent your whole?
21
Multiple Choice
What is a reasonable product for 2.1 x 3
0.63
6.3
63
630
22
Multiple Choice
What is a reasonable product for 4.27 x 6=
2562
2.562
25.62
256.2
23
Open Ended
How do you know?
24
Multiple Choice
What is a reasonable product for 7 x 6.053=
4237.1
4.2371
42.371
42371
25
Open Ended
How do you know?
26
Multiple Choice
Yi Ting weights 8.3 kg. Her older brother is 4 times as heavy as Yi Ting. How much does her older brother weight?
24kg
33.2 kg
12.3kg
332 kg
27
Multiple Choice
Tim is painting his storage shed. He buys 4 gallons of white paint and 3 gallons of blue paint. Each gallon of white paint costs $15.72 and each gallon of blue paint costs $21.78. How much money will Tim spend in all on paint.
$37.50
$62.88
$128.22
65.38
Multiplying Decimals
Review of Module 1 Lesson 11 and 12
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