Place Value X by 10 by v1Nibn1t

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									  Place Value and Multiplication
   millions     thousands

  Before the      After decimal
               . 10 1the100 10 point
 100 10 1 100                    1
 decimal point
1000 100 10 1       1/        1/         1/          1/
                .        10        100        1000        10000
   Place Value & X by 10
  millions        thousands

100 10       1   100 10   1    100 10   1

                                   3    2

                               3   2    0
                          7,   8   9    5

                    7     8, 9     5    0
     Place Value & X by 10
    millions         thousands

100 10         1    100 10   1    100 10   1

                        2    3,   4   5    6

                    2   3    4, 5 6 0
       8       9,   0   1    2,   3   4    5

8     9        0, 1      2 3, 4 5 0
   Place Value & X by 10
 thousands                  After the
                            decimal
                             point
100 10   1   100 10   1   . 1/10 1/100

                      0 .     8    2

                      8. 2
                      1   .   0    3

                 1 0 .3
    When you multiply by ten
• The answer gets bigger
• The decimal point moves to the right one
  place or the numbers move one place to
  the left

          4 6 . 5. 9            2   3   .   0
                            2   3   0   .
 Multiply by 10 -
              The answer gets bigger

3.52 x 10 =       35.2

4.209 x 10 =       42.09

0.06 x 10 =       0.6

0.0086 x 10 =      0.086
  Place Value & X by 100
  millions        thousands

100 10       1   100 10   1    100 10   1

                                   3    2

                          3, 2     0    0
                          7,   8   9    5

                 7   8    9, 5     0 0
  Place Value & X by 100
  millions         thousands

100 10       1    100 10   1    100 10   1

                           3,   4   5    6

                  3 4 5, 6          0    0
             9,   0   1    2,   3   4    5

9 0 1,             2 3 4, 5         0    0
  When you multiply by a hundred
• The answer gets bigger
• The decimal point moves to the right two
  places or the numbers move two places to
  the left
                                2   .   8
     4 6 . 5 9 . 3
                             8 0
                           2 2 8
            Multiply by 100
• 6 x 100   = 600
                    13.5 x 100    = 1350
• 12 x 100 = 1200
                    4.23 x 100     = 423
• 25 x 100 = 2500
                    0.16 x 100     = 16
• 64 x 100 = 6400
                    0.063 x 100     = 6.3
 When you multiply by a thousand
• The answer gets bigger
• The decimal point moves to the right three
  places or the numbers move three places
  to the left
                                   2 .   3 5
        4 .6 5 9 . 3
                             3
                           2 2   2 3
                                 5 0
                                 3 5     5
             Multiply by 1000
• 6 x 1000   = 6,000
                       13.5 x 1000 = 13,500
• 12 x 1000 = 12,000
                       4.23 x 1000   = 4,230
• 25 x 1000 = 25,000
                       0.16 x 1000   = 160
• 64 x 1000 = 64,000
                       0.063 x 1000 = 63
When multiplying by 10,100,1000-
• I know that the number gets bigger
• The place value of each digit is changing
                or
  the decimal point is moving

        101 =10
         I 2 =10 x 10 =100
     Can10do this multiply by just looking at it?
        103 =10 x 10 x 10 =1000
        104 = 10 x 10 x 10 x 10=10000

								
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