Download Dividing Decimals - Skyline R2 School

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Objective
Divide decimals by whole numbers
Review Vocabulary
Quotient
The solution in division
Example 1 Divide a Decimal by a 1-Digit Number
Example 2 Divide a Decimal by a 2-Digit Number
Example 3 Round a Quotient
Find
Write problem using the division
house
Put the first number in the house
Put the second number outside the
house
How many times does 3 go into 4?
Multiply 3  1 and place under the 4
Subtract 4 - 3
Bring down the 5
1/3
How many times does 3 go into 15?
Find
Multiply 3  5 and place under the
15
Subtract 15 - 15
Bring down the 9
How many times does 3 go into 9?
Multiply 3  3 and place under the 9
Subtract 9 - 9
Put decimal in answer directly
above decimal in house
Answer: 15.3
1/3
Find
Answer: 12.7
1/3
Find
Write problem using the division
house
Put the first number in the house
Put the second number outside the
house
How many times does 22 go into 8?
22 will not go into 8
How many times does 22 go into
86?
2/3
Find
Multiply 22  3 and place under the
86
Subtract 86 - 66
Bring down the 9
How many times does 22 go into
209?
Multiply 22  9 and place under the
209
Subtract 209 - 198
Annex a 0 and bring down
2/3
Find
How many times does 22 go into
110?
Multiply 22  5 and place under the
110
Subtract 110 - 110
Put decimal in answer directly
above decimal in house
Answer: 0.395
2/3
Find
Answer: 0.36
2/3
During a science experiment, Nita measured the mass
of four unknown samples. Her data table is shown
below. What is the mean mass of the four samples?
Sample 1
6.23 g
Sample 2
5.81 g
Sample 3
5.93 g
Sample 4
6.47 g
Remember: To find the mean,
add the data, then divide by how
many pieces of data
There are 4 pieces of data
A+B+C+D
Mean =
4
3/3
Mean = A + B + C + D
4
5.81 + 5.93 + 6.47
Mean = 6.23 +
4
Sample 1
6.23 g
Sample 2
5.81 g
Sample 3
5.93 g
Sample 4
6.47 g
Replace A with Sample 1 of 6.23
Replace B with Sample 2 of 5.81
Replace C with Sample 3 of 5.93
Replace D with Sample 4 of 6.47
Bring down the 4
3/3
Follow order of operation
P
E
MD AS
Mean = A + B + C + D
4
5.81 + 5.93 + 6.47
Mean = 6.23 +
4
Mean = 24.44
4
4 24.44
Fraction bar considered
an enclosure
Add the numerator
Bring down the 4
Write division using the
house
Put numerator in house
Put denominator outside
the house
3/3
How many times does 4 go into 2?
Mean = 24.44
4
6
4 24.44
- 24
04
4 will not go into 2
How many times does 4 go into 24?
Multiply 4  6 and place under the
24
Subtract 24 - 24
Bring down the 4
3/3
How many times does 4 go into 4?
Mean = 24.44
4
6.1 1
4 24.44
- 24
04
- 4
04
-4
0
Multiply 4  1 and place under the 4
Subtract 4 - 4
Bring down the 4
How many times does 4 go into 4?
Multiply 4  1 and place under the 4
Subtract 4 - 4
Put decimal in answer directly
above decimal in house
Answer: Mean = 6.11 grams
3/3
*
GRID-IN TEST ITEM The birth weights of four babies
born at City Hospital last Friday are given in pounds.
What is the mean birth weight?
Baby 1
7.35 lb
Baby 2
6.52 lb
Baby 3
8.33 lb
Baby 4
7.68 lb
Answer: Mean = 7.47 lb
3/3
Assignment
Lesson 4:3
Dividing Decimals
by Whole Numbers
12 - 26 All