Transcript Decimal Division - Rutherford County Schools

Dividing Decimals
0011 0010 1010 1101 0001 0100 1011
I CAN divide decimals
by a whole numbers
and decimals.
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Parts of a Division Problem:
0011 0010 1010 1101 0001 0100 1011
9
5 45
divisor
quotient
dividend
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0011 0010 1010 1101 0001 0100 1011
To divide a decimal by a
whole number move the
decimal point straight up
and then divide as usual
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Example 1
0011 0010 1010 1101 0001 0100 1011
25 7.5
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Terminating decimal is a decimal
number that ends, or
terminates in the quotient.
Let’s do a few together
0011 0010 1010 1101 0001 0100 1011
11 4.4
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Example 2: Showing the
Remainder as a Decimal.
0011 0010 1010 1101 0001 0100 1011
• Place the decimal
point in the dividend
and then move it up
to the quotient.
• Add a zero to the
dividend.
• Continue dividing.
130 ÷ 20
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Now you try.
Hint: You may need to add more than one zero!
0011 0010 1010 1101 0001 0100 1011
4 37
8 12 .6
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You try this….
0011 0010 1010 1101 0001 0100 1011
2÷3
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Repeating decimal is a decimals that
one or more numbers repeat.
Dividing Decimals by a Decimal
0011 0010 1010 1101 0001 0100 1011
I CAN divide decimals
by a whole numbers
and decimals.
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2
4
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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• To divide a decimal by a decimal move the decimal point
in the divisor over to make a whole number.
• Then you move the same amount of spaces in your
dividend.
0011 0010 1010 1101 0001 0100 1011
1.35 ÷ .45
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Modeling .35 ÷ 7
0011 0010 1010 1101 0001 0100 1011
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You try this….
0011 0010 1010 1101 0001 0100 1011
Find each quotient.
1. 49 ÷ 0.7
2. 21.63 ÷ 2.1
3. 38.43 ÷ 6.1
4. 16.9 ÷ 5.2
5. John spent $13.44 renting 4 videos for the
weekend. What was the cost per video?
6. After driving 191.1 miles, the Changs’ used
10.5 gallons of gas. On average, how many
miles did they drive per gallon of gas?
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