Do Now

1
Do Now

• Your favorite pizza place announces it is going
  to raise the price of a slice of pizza. They say
  that it will be more than 1.90 and less than
  2.00. List the possible cost of one slice of
  pizza.

2
A Slice Could Cost
1.94
1.91
1.92
1.93
1.97
1.98
1.96
1.95
1.99
3
Connection to Measurement
1.1 cm
The red arrow is pointing to ______
2.35 cm
The blue arrow is pointing to ______
Lets take a look at how we came up with 2.35 cm.

4
Reviewing our Answer
The blue arrow is pointing to somewhere between
2.3 cm and 2.4 cm. If you look closer, it looks
like it is exactly between the two values. Now
think of money. What price is exactly between
2.30 and 2.40?
2.35 OR 2.35 cm
5
Practice

• We are now going to practice doing this with the
  Estimate the Last Digit worksheet. Put this
  sheet in your notes section. Use the slice of
  pizza example to help you do this sheet. If it
  is exactly on the line then be exact. If it is
  between numbers, estimate what the value could
  be. Think of money. Label all units.

6
Estimate the Last Digit
a _________ b _________ c _________ d
_________ e _________f _________ g
_________ h _________ i _________ j
_________
12.20 cm
6.50 cm
8.30 cm
1.90 cm
10.10 cm
3.80 cm
0.90 cm
5.50 cm
11.60 cm
11.00 cm
7
Estimate the Last Digit
a _________ b _________ c _________ d
_________ e _________f _________ g
_________ h _________ i _________ j
_________
61.9 cm
57.2 cm
56.5 cm
50.7 cm
61.0 cm
55.8 cm
52.1 cm
54.0 cm
58.6 cm
60.0 cm
8
Estimate the Last Digit
a _________ b _________ c _________ d
_________ e _________f _________ g
_________ h _________ i _________ j
_________
38.02 cm
32.74 cm
36.80 cm
32.05 cm
30.81 cm
29.70 cm
26.08 cm
28.57 cm
33.88 cm
35.00 cm
9
Significant Figures
a _________ b _________ c _________ d
_________ e _________f _________ g
_________ h _________ i _________ j
_________
75.8 cm
66.3 cm
74.0 cm
74.8 cm
65.2 cm
67.5 cm
71.7 cm
69.9 cm
All answers can be plus or minus 0.1 cm.
72.6 cm
68.4 cm
10
Significant Figures
a _________ b _________ c _________ d
_________ e _________f _________ g
_________ h _________ i _________ j
_________
49.16 cm
41.18 cm
47.69 cm
45.73 cm
40.36 cm
38.41 cm
46.72 cm
39.56 cm
All answers can be plus or minus 0.02 cm.
42.75 cm
44.31 cm
11
Metric System

• What are the base units and how do we convert
  them?

12
First Thing

• You need to know the base units.

13
Base Units
14
Next Step

• Now that you know what measurement you will be
  using, you need to know the order of the other
  units.
• The base unit goes in the middle and the other
  units go around it.
• There is a really easy way to remember them.
  They are in the following slides.

15
Meter

• Just remember
• Kids Hate Doing Math During Certain Months.
• Each of these letters stands for a measurement in
  the metric system.

16
Kids Hate Doing Math During Certain Months.
Kilometer
Hectometer
Centimeter
Millimeter
Dekameter
Meter
Decimeter
The largest unit is on the left and the smallest
unit is on the right.
17
Metric Abbreviations
18
Can you spot the mistake on these two metric
rulers?
The ones circled in red capitalized the letters.
This is a very common mistake. The letters
should be lower cased (circled in blue).
19
Liter

• Just remember
• Kids Hate Doing Literature During Certain Months.
  
• Each of these letters stands for a measurement in
  the metric system.

20
Kids Hate Doing Literature During Certain Months.

Kiloliter
Hectoliter
Centiliter
Milliliter
Dekaliter
Liter
Deciliter
Again, the largest unit is on the left and the
smallest unit is on the right.
21
Metric Abbreviations
22
Gram

• Just remember
• Kids Hate Doing Geography During Certain Months.
• Each of these letters stands for a measurement in
  the metric system.

23
Kids Hate Doing Geography During Certain Months.
Kilogram
Hectogram
Centigram
Milligram
Dekagram
Gram
Decigram
Again, the largest unit is on the left and the
smallest unit is on the right.
24
Metric Abbreviations
25
Lets Try to Convert

• 1,000 m ? km

26
First Step

• What is the base unit?
• Thats right the base unit is meters.
• Now what?

27
Write Down the Order of the Units

• Kids Hate Doing Math During Certain Months.
• This gives you all of the units in the proper
  order. Now all you have to do is count the
  number of units would move to get from the known
  value (meters) to the unknown value (kilometers).
  

28
Kids Hate Doing Math During Certain Months
km
hm
dkm
m
mm
dm
cm
1
2
3
Since we know that we have 1,000 m that is where
we are starting at (circled in red). We want to
end up at km (square in red). Now all we have to
do is count the number of times we would have to
move in order to wind up at km.
29
Last Step

• Take the number you were given (1,000 m) and move
  the decimal point the same direction and the same
  amount as you did in the previous slide.

30
1 000
,
.
1
2
3
If a number does not have a decimal point, it is
understood to be to the right of the last number.
Think of money. So in this case, the decimal
point would be to the right of the last zero.
Watch it appear in red when you left mouse click.
We will now move the decimal three places to
the left to convert from meters to kilometers.
31
Finally

• So now we know that 1,000 m is equal to 1 km.

32

• This technique works for the metric units for
  meters, liters and grams. You just have to put
  the base unit you are using in the middle.

33
Practice

• Convert the following
• 15 L ? mL

34
Kids Hate Doing Literature During Certain Months
dL
cL
kL
hL
dkL
L
mL
1
2
3
Now all we have to do is move the decimal point
three places to the right. Click to see this on
the next slide.
35
15 L ? mL
.
Since it does not have a decimal point, we will
add one to the right of the 5. Left mouse click
to add the decimal point, it will appear in red.

36
15 L ? mL
.
Now move the decimal point three places to the
right.
15
.
000
Now we need to add zeroes to hold the place of
the decimal point.
So we can see that 15 L 15,000 mL.
37
Practice

• Convert the following
• 3,483 mg ? hg

38
Write Down the Order of the Units

• Kids Hate Doing Geography During Certain Months
• This gives you all of the units in the proper
  order. Now all you have to do is count the
  number of units would move to get from the known
  value (mg) to the unknown value (hg).

39
Kids Hate Doing Geography During Certain Months
dg
cg
kg
hg
dkg
g
mg
5
1
2
3
4
Now all we have to do is move the decimal point
five places to the left. Click to see this on
the next slide.
40
3 483
.
0
,
Since it does not have a decimal point, we will
add one to the right of the 3. Left mouse click
to add the decimal point, it will appear in red.

Now move the decimal point five places to the
left. Click to see this happen.
Now we need to add one zero to hold the place of
the decimal point and erase the ,.
41
Finally

• So now we can see that 3,483 mg _______ hg.

0.03483
We also add a zero before the decimal point too.