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					The Power of Decimals




          1
                Introduction

Instructions:
 1) Read each slide carefully. Remember, you are
     responsible for this information!
 2) If you wish to go back, click the back arrow
 3) Answer the questions at the end of each section.
     This will allow you to move on to the next question
 4) Have fun!



                            2
    Introduction to decimals


 Decimals are used to show PART of a whole number

 Partial numbers fall to the right of the DECIMAL
  POINT




       Whole
                         1.5                    Partial number




       number

                           3
            Place names

     The farther right the decimal
        place, the smaller size.
   See labels below



            2.89
                              Hundreths
Ones                          (smallest)
(small)           Tenths
                  (smaller)
                       4
   Fractions and Decimals


    All fractions can be converted into decimals
           (Some look messier than others.)

Examples


½= 0.5                      1/10= 0.1
  1/4= 0.25             1/7= 0.14285
                       5
                    Question 1


                        2.63
         Which number is in the hundredths place ?
1.   2
2.   3
3.   6
4.   0

                             6
                   Incorrect

Remember:
The farther right, the smaller the number




Try again




                           7
                     Correct!


Exactly! 3 is the hundredths place. It has the smallest
  value because it is farthest right

Click here to continue




                            8
         Ordering decimals

       To put decimals in numerical order:

         Work left to right!!
Once you find the higher number, stop!
               Example
                                             Not
                                             needed


same                     same
                                Smaller!
          Bigger!               Stop!
          Stop!            9
Ordering decimals




        10
     Which number is bigger?


1.   2.39
2.   2.48
3.   2.47
4.   2.36
5.   2.43890798698
                 11
                   Incorrect


 Remember, work left to right. Click here to double
  check the slide.

 Try again?




                          12
                         Correct!


Exactly. 2.48 is the largest of the numbers

 Click here for Question 2




                                13
Which number is smaller?


          A. 8
         B. 8.1
         C. 8.15
        D. 8.155

           14
              Sorry, not quite!


If no decimal is present, it is the same as zero.

Click here to try again




                             15
                     Exactly!

 Since the first numbers are the same, 8 is the smallest
  because it has no decimals

 Click here to continue




                            16
                   Rounding


 Rounding is changing decimals into whole number
 This helps for easy adding and subtracting estimates
 Examples:




                           17
How do I know which way to round?



              Easy Rule
           0.5 and above= Round up

         0.49 and below= Round down




                     18
        Why bother rounding?


 Rounding helps make adding and subtracting easier.
 Example:

               3.41+7.82=?
                3.41 rounds down to 3
                 7.82 rounds up to 8

         3+8=11 (much easier)
                           19
          Rounding Practice


 Round the numbers in this equation and estimate the
  answer

                2.76+7.11=?
A. About 9
B. About 10
C. About 11
D. About 7

                          20
            Nope, try again


-Remember the Easy Rule: 0.5 and above= Round Up
                       0.49 and below = Round Down

Try Again




                        21
                     Exactly!


 2.76 rounds up to 3
 7.11 rounds down to 7
 7+3= about 10!



 Click here to continue



                           22
Adding and Subtracting Decimals


  Decimals add together just like whole number.
            Two things to remember:

 1. Make sure the decimals line up
  2. If no decimal is present in one
           number, add a zero
                                      Click to see
                                      examples
                         23
Adding and Subtracting Examples




   3.45+2.9=?         3.45+2.9=?

     3.4 5              3.4 5
       2.9 +            2.9 0 +
     3 .74              6.35
                24
Adding and Subtracting Examples




    8 - 4.39=?        8 - 4.39= ?

      4.39               8.00
         8 -             4.39 -
      4.31               3.61
                 25
                   Practice!


What is the sum of 4.38 + 2.8
(use paper and pencil if needed)

A. 7.28
B. 6
C. 4.66
D. 7.18

                          26
           Nice try, bye-bye…


Try again. Click here if you would like to view the slides
  again.




                            27
                    Correct!!


 Well done! You lined up the decimals and used a zero
  when needed.

 Click here to continue




                           28
         Subtraction practice!


 What is the difference of 9.78-5.1=?
A. 4.38
B. 9.27
C. 9.28
D. 4.68




                            29
                       Nope


 Remember to add zeros when needed.


                             Bah,
                           Humbug!



Click here to try again…



                            30
          You’re doing great!


Well done, you have the hang out this




 Click here to continue




                           31
                 Metric System


 Decimals help us
  understand the metric
  system
 Large measurements can
  be made smaller with
  decimals
 This helps measure smaller
  items (and people!)

                               32
           Distance Measuring



 1/100 of a meter (or 0.01)         100 centimeters
 Good for measuring small           Good for measuring long
  distances (like the length          distances (like the
  of your computer screen)            distance between
                                      countries!


                               33
              Mass Measuring


 1000 grams
 Good for measuring large          1/1000 of a kilogram (or
  masses (like an elephant)          0.001)
                                    Good for measuring small
                                     masses (like this rat)




                              34
            Volume Measuring



 1000 mililiters                  1/1000 of a liter (0.001
                                    liters)
 Large liquid amounts
                                   Good for small liquids
 This bottle is a 2 liter
  bottle                           Found in science a lot




                             35
                                Units


                                 1000
                                 0.01
                                 0.001

These can be applied to ANY
measurement! (i.e. Kilograms,
Centiliters, kiloliters etc)

                                  36
                  Quiz time!


 What would I most likely use to measure the mass of
  a house?

A.   Grams
B.   Liters
C.   Kilograms
D.   Meters

                          37
                   Not quite…




 Not quite, remember “mili” means 0.001 (smaller)
                           “Kilo” means 1000 (larger)


Click here to try again!

                               38
                    Exactly!!!



 Good job, you’re really doing well!



 Click here to continue



                            39
     Just two more questions!


What would you use liters to measure?

1)   The mass of your little brother
2)   The volume of a swimming pool
3)   The distance from your house to Central
4)   The volume of a juice box



                           40
                   Incorrect


Click here to review the slides about volume.

(If you need to look closer at the slides, remember, you
   can always click the “back” arrow before answering
   questions.)




                            41
                  You’re right!


 Liters would work for a swimming pool!
   Liters would not work well for a juice box.
   Milliliters are smaller and would work a lot better


Continue!




                              42
             Final Question!


You are planning on driving to New York this week.
   How would you measure the distance to see how
   much gas you will need? (remember the slide on
   units)
A. Liters
B. Centimeters
C. Meters
D. Kilometers

                         43
                    Incorrect


 Good guess, it’s a tricky question. Remember that
  units (Kilo, mili and centi) can apply to ANY type of
  measuring.

Click here to try again




                            44
            Exactly!! Good job!


 A Kilometer is 1000 meters. This would work very
  well in measuring a long distance!

Continue!




                          45
                    Almost…


 You could use meters to
  measure the distance, but
  it’s not the best answer.

 Remember, it might be
  something not covered.

 Try again

                              46
                       The End


Well done! You obviously
 know your stuff when it
 comes to decimals and
 measuring! Good luck on
 the test, I know you’ll do
 great!

Click the flag to end the
   assignment
                              47
                    Content


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                        52
Question slide




      53
                   Incorrect




 Click here to try again




                            54
            Correct


Continue!




              55
Question slide




      56
                   Incorrect




 Click here to try again




                            57
            Correct


Continue!




              58
The End




   59

				
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