Transcript Divide a Decimal by a Decimal. Step 1

5 Minute Check
Estimate and divide .Round to the nearest
tenth, if necessary.
1. 10.22 ÷ 14
2. 59.84 ÷ 32
3. 751.2 ÷ 25
4. 6271 ÷ 4
5 Minute Check
Estimate and divide .Round to the nearest
tenth, if necessary.
1. 10.22 ÷ 14
5 Minute Check
Estimate and divide .Round to the nearest
tenth, if necessary.
1. 10.22 ÷ 14 ≈ 1
00.73 = 0.7
14)10.22
-98
42
-42
00
5 Minute Check
Estimate and divide .Round to the nearest
tenth, if necessary.
2. 59.84 ÷ 32
5 Minute Check
Estimate and divide .Round to the nearest
tenth, if necessary.
2. 59.84 ÷ 32 ≈ 2
01.87 = 1.9
32)59.84
-32
278
-256
224
-224
5 Minute Check
Estimate and divide .Round to the nearest
tenth, if necessary.
3. 751.2 ÷ 25
5 Minute Check
Estimate and divide .Round to the nearest
tenth, if necessary.
3. 751.2 ÷ 25 ≈ 30
030.04 = 30
25)751.20
-75
0120
-100
5 Minute Check
Estimate and divide .Round to the nearest
tenth, if necessary.
4. 6271 ÷ 4
5 Minute Check
Estimate and divide .Round to the nearest tenth,
if necessary.
4. 6271 ÷ 4 ≈ 1500
1567.75 = 1567.9
4)6271.00
-4
22
-20
27
-24
31
-28
30
-28
20
Monday, Sept 29
Lesson 6.3.8
Divide Decimals by Decimals
Divide Decimals by Decimals
Objective: To understand how to divide
decimals by decimals.
Divide Decimals by Decimals
When dividing a decimal by a decimal, change
the divisor to a whole number. To do this,
move the decimal in both the divisor and
dividend to the right. Then divide as before.
Divide Decimals by Decimals
Find 1.71÷ 0.9
Divide Decimals by Decimals
Find 1.71÷ 0.9
Divide a Decimal by a Decimal.
Step 1 – Place the numbers in the dividing
bracket.
Divide Decimals by Decimals
Find 1.71÷ 0.9
Divide a Decimal by a Decimal.
Step 1 – Place the numbers in the dividing
bracket.
0.9)1.71
Divide Decimals by Decimals
Find 1.71÷ 0.9
Divide a Decimal by a Decimal.
Step 2 – Move the decimal point to the right
in both numbers until the divisor is a whole
number.
0.9)1.71
Divide Decimals by Decimals
Find 1.71÷ 0.9
Divide a Decimal by a Decimal.
Step 2 – Move the decimal point to the right
in both numbers until the divisor is a whole
number.
09.)17.1
Divide Decimals by Decimals
Find 1.71÷ 0.9 =
To Divide a decimal by a decimal
Step 3 – Divide as before. You can drop the
decimal point and zero in front of the divisor.
9 )17.1
Divide Decimals by Decimals
Find 1.71÷ 0.9 = 1.9
To Divide a decimal by a decimal
Step 3 – Divide as before. You can drop
decimal point and the zero in front of the
divisor.
1.9
9 )17.1
-9
81
-81
00
Divide Decimals by Decimals
Find 2.64÷ 0.6
Step 1 - ?
Divide Decimals by Decimals
Find 2.64÷ 0.6
0.6)2.64
Step 2 - ?
Divide Decimals by Decimals
Find 2.64÷ 0.6
0.6)2.64 = 06.)26.4
Step 3 - ?
Divide Decimals by Decimals
Find 2.64÷ 0.6 = 4.4
4.4
0.6)2.64 = 06.)26.4
-24
024
-24
0
6, 12, 18, 24, 30, 36, 42, 48, 54, 60
Divide Decimals by Decimals
Find.
54.4 ÷ 1.7
Do this on your own
Divide Decimals by Decimals
Find
54.4 ÷ 1.7 =32
32
1.7)54.4 = 17)544
-51
34
-34
0
Divide Decimals by Decimals
Find
8.424 ÷ 0.36
Do this on your own
Divide Decimals by Decimals
Find
8.424 ÷ 0.36 =23.4
23.4
0.36)8.424 = 36)842.4
-72
122
-108
144
-144
000
Divide Decimals by Decimals
Find
52 ÷ 0.4
Do this on your own.
Divide Decimals by Decimals
Find
52 ÷ 0.4 = 130
130
0.4)52 = 4)520
-4
12
-12
0
Divide Decimals by Decimals
Find.
0.009 ÷ 0.18
Do this on your own.
Divide Decimals by Decimals
Find
0.009 ÷ 0.18 = 0.05
000.05
0.18)0.009 = 18)000.90
-90
00
Divide Decimals by Decimals
Find
11.2 ÷ 0.07
Do this on your own.
Divide Decimals by Decimals
Find
11.2 ÷ 0.07 = 160
0160
0.07)11.2 = 7)1120
-7
42
-42
0
Divide Decimals by Decimals
The average person’s stride length (the
distance covered by one step) is about 2.5 ft
long. How many steps would the average
person take to travel 50 ft?
Do this on your own.
Divide Decimals by Decimals
The average person’s stride length (the
distance covered by one step) is about 2.5 ft
long. How many steps would the average
person take to travel 50 ft? 20 steps
020
2.5)50 = 25)500.
-50
00
Divide Decimals by Decimals
Frank made $ 98.20 last week. Erin made
$51.20 last week. How many times more was
Frank’s paycheck as Erin’s? Round to the
nearest tenth.
(Do this on your own)
Divide Decimals by Decimals
Frank made $ 98.20 last week. Erin made
$51.20 last week. How many times more was
Frank’s paycheck as Erin’s? Round to the
nearest tenth.
Take out the ugly numbers and substitute friendly
numbers. What if Frank made $100 and Erin made
$50. How many more times was Frank’s paycheck?
What operation did you use to solve?
Divide Decimals by Decimals
Frank made $ 98.20 last week. Erin made
$51.20 last week. How many times more was
Frank’s paycheck as Erin’s? Round to the
nearest tenth. 1.9 as much
0001.91
51.20)98.20 = 5120)9820.00
-5120
47000
-46080
9200
Divide Decimals by Decimals
Alaska has a coastline of about 6.64
thousand miles. Florida has a coastline of
about 1.35 thousand miles. How many times
more coastline does Alaska have than
Florida? Round to the nearest tenth, if
necessary.
Do this on your own.
Divide Decimals by Decimals
Alaska has a coastline of about 6.64 thousand
miles. Florida has a coastline of about 1.35
thousand miles. How many times more coastline
does Alaska have than Florida? Round to the
nearest tenth, if necessary.
Take out the ugly numbers and substitute friendly numbers.
What if Alaska’s coastline was 7 thousand miles and
Florida’s coastline was 1 thousand miles? How many
more times is Alaska than Florida? What operation did
you use to solve?
Divide Decimals by Decimals
Alaska has a coastline of about 6.64
thousand miles. Florida has a coastline of
about 1.35 thousand miles. How many times
more coastline does Alaska have than
Florida? Round to the nearest tenth, if
necessary.
004.9
4.9 times
1.35)6.64 = 135)664.00
-540
1240
1215
250
Divide Decimals by Decimals
Identify which expression does not belong.
Explain.
49 ÷ 7
4.9 ÷ 7
0.49 ÷ 0.7
0.049 ÷ 0.07
Divide Decimals by Decimals
Identify which expression does not belong.
Explain.
49 ÷ 7 = 7
4.9 ÷ 7 = 0.7
0.49 ÷ 0.7 = 0.7
0.049 ÷ 0.07 = 0.7
Divide Decimals by Decimals
Homework Practice 6.3.8
Due Tuesday, Sept 30
Must show all work.
Chapter 6.3 Test -Wednesday, Oct 1
Accum Rev 3 due by Oct 1