Transcript Dividing Decimalsx

Dividing Decimals
Warm Up Exercise
1. 2.15 x 7.1
2. 9.77 x 5.4
3. 2.872 x 4.3
4. 9.355 x 6.4
Warm Up Exercise
1. 2.15 x 7.1 = 15.265
2. 9.77 x 5.4
3. 2.872 x 4.3
4. 9.355 x 6.4
Warm Up Exercise
1. 2.15 x 7.1 = 15.265
2. 9.77 x 5.4 = 52.758
3. 2.872 x 4.3
4. 9.355 x 6.4
Warm Up Exercise
1. 2.15 x 7.1 = 15.265
2. 9.77 x 5.4 = 52.758
3. 2.872 x 4.3 = 12.3496
4. 9.355 x 6.4
Warm Up Exercise
1. 2.15 x 7.1 = 15.265
2. 9.77 x 5.4 = 52.758
3. 2.872 x 4.3 = 12.3496
4. 9.355 x 6.4 = 59.872
Lesson Objective
• Multiply decimals lesson tutorial:
http://www.virtualnerd.com/middlemath/decimals/multiplying/decimalmultiplication-method
Lesson Objective
• We can divide decimals
Division Vocabulary
.2 12.64
“Outside”
Divisor
“Inside”
Dividend
“Roof”
Quotient
Division Vocabulary
12.64 ÷ .2
12.64 divided by .2
.2 12.64
Steps in Dividing Decimals
1. Make the divisor (outside number) a whole number by moving
(swingin’) the decimal to the right as many places as it takes to
make it a WHOLE NUMBER.
2. In MONKEY TERMS: Whatever the outside monkey does (how far
it swings) the inside monkey does also. Then the monkey climbs
up and sits on the roof!
Swingin’ Monkeys
Divisor
.2 12.64
Moved (swung) the
decimal point 1
place to the right
Steps in Dividing Decimals
2. Move (swing) the decimal point in the dividend the same number
of places as the divisor.
.2 12.64
Moved (swung) the
decimal point 1
place to the right
Dividend
Steps in Dividing Decimals – Swingin’
Monkeys
.2 12.64
Steps in Dividing Decimals – Swingin’
Monkeys
3. Place (swing) the decimal point in the answer (quotient) lined up
with the decimal point in the dividend (on the roof).
.2 12.64
Steps in Dividing Decimals
4. Now, divide as usual!
2 126.4
Steps in Dividing Decimals
4. Divide the numbers. Make sure the decimal point stays
lined up.
63 2
2 126.4
12
6
6
4
Practice
3.2 ÷ .8
a.
b.
c.
d.
4
40
0.4
0.004
Practice
3.2 ÷ .8
a. 4
Practice
2.85 ÷ 0.03
a.
b.
c.
d.
.95
9.5
95
950
Practice
2.85 ÷ 0.03
c. 95
Practice
0.15 ÷ 0.5
a.
b.
c.
d.
.03
0.3
3
30
Practice
0.15 ÷ 0.5
b. 0.3
Practice
4.22 ÷ 0.2
a.
b.
c.
d.
211
2110
21.1
2.11
Practice
4.22 ÷ 0.2
c. 21.1
Dividing Decimals
• Dividing Decimals study jams:
http://studyjams.scholastic.com/studyjams/ja
ms/math/decimals-percents/division-ofdecimals.htm