Mid-Chapter Check

download report

Transcript Mid-Chapter Check

Mid-Chapter Check
Find, round to the nearest tenth, if necessary.
1. 10.22 ÷ 14
2. 59.84 ÷ 32
3. 751.2 ÷ 25
4. 6271 ÷ 4
Mid-Chapter Check
Find, round to the nearest tenth, if necessary.
1. 10.22 ÷ 14
Mid-Chapter Check
Find, round to the nearest tenth, if necessary.
1. 10.22 ÷ 14 = 0.7
00.73
14)10.22
-98
42
-42
00
14, 28, 42, 56, 70, 84, 98
Mid-Chapter Check
Find, round to the nearest tenth, if necessary.
2. 59.84 ÷ 32
Mid-Chapter Check
Find, round to the nearest tenth, if necessary.
2. 59.84 ÷ 32 = 1.9
01.87
32)59.84
-32
278
-256
224
32, 64, 96, 128, 160, 192, 224, 256
Mid-Chapter Check
Find, round to the nearest tenth, if necessary.
3. 751.2 ÷ 25
Mid-Chapter Check
Find, round to the nearest tenth, if necessary.
3. 751.2 ÷ 25 = 30.0
030.04
25)751.20
-75
0120
25, 50, 75, 100, 125, 150, 175, 200, 225
Mid-Chapter Check
Find, round to the nearest tenth, if necessary.
4. 6271 ÷ 4
Mid-Chapter Check
Find, round to the nearest tenth, if necessary.
4. 6271 ÷ 4 = 1567.8
1567.75
4)6271.0
-4
22
-20
27
-24
31
-28
30
-28
20
4,8,12,16,20,24,28,32,36,40,44,48,52,56,60
Flashcards
Wednesday, Oct 16
Lesson 3.8
Divide Decimals by Decimals
Divide Decimals by Decimals
Objective: To understand how to estimate
and 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
Estimate?
Divide Decimals by Decimals
Find 1.71÷ 0.9
Estimate?
2÷1=2
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
To Divide a decimal by a decimal
Step 2 – Move the decimal point to the right
in both numbers so the divisor is a whole
number.
09.)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
Estimate?
Divide Decimals by Decimals
Find 2.64÷ 0.6
Estimate?
3÷1=3
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
Estimate?
Divide Decimals by Decimals
Find 54.4 ÷ 1.7
Estimate?
54 ÷ 2 = 27
Actual quotient?
Divide Decimals by Decimals
Find 54.4 ÷ 1.7 = 32
32
1.7)54.4 = 17)544
-51
34
-34
0
17,34,51,68,85,102
Divide Decimals by Decimals
Find 8.424 ÷ 0.36
(Do this on your own)
Divide Decimals by Decimals
Find 8.424 ÷ 0.36
Estimate?
Divide Decimals by Decimals
Find 8.424 ÷ 0.36
Estimate?
8 ÷ 0.5 = 16
Remember – you can not
divide by 0.
Actual quotient?
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
36, 72, 108, 144, 180, 216, 252
Divide Decimals by Decimals
Find 0.009 ÷ 0.18
Estimate?
Divide Decimals by Decimals
Find 0.009 ÷ 0.18
Estimate?
Since both numbers are close to zero, the
estimate would be zero.
Actual quotient?
Divide Decimals by Decimals
Find 0.009 ÷ 0.18 = 0.05
000.05
0.18)0.009 = 18)000.90
-90
00
18,36, 54,72, 90, 108, 126,144,
Divide Decimals by Decimals
Frank made $ 98.20 last week. Erin made $51.20 last week.
How many times as much money did Frank make as Erin?
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 as much money did Frank make as Erin?
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
Agenda Notes
Homework – Homework Practice 3-8
Due Thursday, Oct 17
Must show all work.
Chapter 3 Test –Friday, Oct 18
Help session – Thursday, Oct 17 2:15-3PM