Transcript DecimalDivision

Decimal Division
0011 0010 1010 1101 0001 0100 1011
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To divide a decimal by a
whole number move the
decimal point straight up
and then divide as usual
0011 0010 1010 1101 0001 0100 1011
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Example:
25 7.5
0011 0010 1010 1101 0001 0100 1011
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25 7.5
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Move your decimal point
straight up, then divide
Let’s do a few together
0011 0010 1010 1101 0001 0100 1011
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11 4.4
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0011 0010 1010 1101 0001 0100 1011
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11 44
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To divide a decimal by a
0011 0010 1010 1101 0001 0100 1011
decimal move the
decimal point in the divisor
over to make a
whole number:
45 1 35
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Now, move the decimal point
0011 0010 1010 1101 0001 0100 1011
in the dividend over the same
number of spaces and then
move your decimal point
straight up and divide
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45 1 35
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0011 0010 1010 1101 0001 0100 1011
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45 135
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Dividing Decimals
“Swingin’ Monkeys”
0011 0010 1010 1101 0001 0100 1011
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Swinging Monkeys!
0011 0010 1010 1101 0001 0100 1011
Follow these steps and you will
be great at dividing decimals!
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Remember: Whatever the
OUTSIDE monkeys do – the
INSIDE monkeys do also!
Division Vocabulary
0011 0010 1010 1101 0001 0100 1011
.2 12.64
“Outside”
Divisor
“Inside”
Dividend
“Roof”
Quotient
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Division Vocabulary
0011 0010 1010 1101 0001 0100 1011
12.64 ÷ .2
12.64 divided by .2
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.2 12.64
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Steps in Dividing Decimals
0011 0010 1010 1101 0001 0100 1011
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.
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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!
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Swingin’ Monkeys
0011 0010 1010 1101 0001 0100 1011
Divisor
.2 12.64
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Moved (swung)
the decimal point
1 place to the
right
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Steps in Dividing Decimals
0011 0010 1010 1101 0001 0100 1011
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
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Dividend
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Steps in Dividing Decimals –
Swingin’ Monkeys
0011 0010 1010 1101 0001 0100 1011
.2 12.64
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Steps in Dividing Decimals –
Swingin’ Monkeys
0011 0010 1010 1101 0001 0100 1011
3. Place (swing) the decimal point in the answer (quotient)
lined up with the decimal point in the dividend (on the roof).
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.2 12.64
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Steps in Dividing Decimals
0011 0010 1010 1101 0001 0100 1011
4. Now, divide as usual!
2 126.4
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Steps in Dividing Decimals
0011 0010 1010 1101 0001 0100 1011
4. Divide the numbers. Make sure the decimal point stays lined up.
63 2
2 126.4
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What is actually happening . .
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0011 0010 1010 1101 0001 0100 1011
• When you move the • When you move the
decimal one place to
decimal two places
the right to create a
to the right to create
WHOLE number –
a WHOLE number –
you are actually
you are actually
multiplying it by 10!
multiplying it by 100!
• Three?
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Let’s Practice
0011 0010 1010 1101 0001 0100 1011
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Remember: The more neatly
you write and keep the numbers
lined up, the BETTER!
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Your Turn - Practice
0011 0010 1010 1101 0001 0100 1011
1) 14.2 ÷ 0.2 =
2) 25.5 ÷ 1.5 =
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