Division by One Digit Divisors

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Divisionby One DigitDivisors
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What are you doing when you divide?

• Dividing these 16 apples into 4 equal groups,
  gives you 4 groups that have 4 apples in each of
  the groups
• ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?

• When you divide, you are trying to split
  something into equally numbered groups
• Take these 16 apples
• ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?

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Division by One-digit Divisors

• Today you will learn how to divide a three-digit
  dividend by a one-digit divisor, to get a
  quotient without a remainder
• Lets review these terms

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What are the parts of a division problem?

• The dividend is the number you are dividing
• The divisor is the number you are dividing by
• The quotient is the evenly divided result
• The remainder is what is left over that cannot be
  evenly divided

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When we write the problem like this136 ? 5 27
r 1
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When writing it like this
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How do you solve a division problem?

• Solving a division problem is a step by step
  process
• The method we will learn today is based the words
  for the people in our families.
• They are

Father Mother Sister Brother
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The Family Method

• Father

• Find

Mother
Multiply
Sister
Subtract
Brother
Bring Down

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Father

• Father stands for find
• Start by looking at the first number in the
  dividend
• Find the multiple of the divisor that comes
  closest to that number, without going higher
• Use your knowledge of math facts, or a
  multiplication grid

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Father find the number closet to the first digit
2
6

• In the 3s, the number closest to 7, but not more
  than 7, is 6

• The other factor is 2

• Put a 2 above the 7

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Mother multiply the number that is the factor
that you found times the divisor

• You found 2, multiply it times the divisor, 3

• 2 times 3 equals 6
• 2 X 3 6

• Put a 6 under the 7

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Sister subtract the number you got by
multiplying the divisor, from the number in the
dividend

• You got a 6 when you multiplied

• Subtract 6 from 7

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• 7 6 1

• The difference must be smaller than the divisor!!!

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Brother bring down the next number, from the
number in the dividend
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• Bring down the next number in the dividend

1

• The new number you have is 11

• Now start over again with Father for the tens

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Now, lets do the second step
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• Father 9 is the closest multiple, the other
  factor you found is 3

• Mother 3 X 3 9, put a 9 under the 11

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• Sister subtract 9 from 11 11- 9 2

1
2

• Brother bring down the 1

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Now, lets do the last step
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• Father 21 is the closest multiple, the other
  factor is 7

• Mother 7 X 3 21, put 21 under the 21

• Sister subtract 21 from 21 21- 21 0

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• Brother nothings left, youre done!

0
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Now, lets practice!
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2

• Father

6
4
8
8

• Mother

6
0

• Sister

• Brother

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Now, lets do the second step
1

• Father

4

• Mother

4

• Sister

4
2

• Brother

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Now, lets do the last step
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• Father

• Mother

• Sister

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• Brother

0
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What do I do with division now?

• Finish the rest of the worksheet
• Homework probs. 1-10, p. 64 in text
• Go to this icon on the class computers
  for extra practice if you have free time
• Look for the same icon on the class website for
  practice at home