1. +
Using Proportions to
Convert Measurements
Ms. Johnson
8th Grade Math

2. +
Systems of Measurement
 DoNow: Write down as many words as you can
that you associate with measurement
Quote of the day:
“Action is the real measure of intelligence.”
-Napoleon Hill

3. +
Systems of Measurement

4. +
 We measure all sorts of quantities. Here are
the main ones:

6. +
Systems of Measurement
 There are two categories we can place the
words you just saw in. These two categories
are called the two systems of measurement
METRIC and CUSTOMARY/STANDARD

7. +
Systems of Measurement
 There are two categories we can place the
words you just saw in. These two categories
are called the two systems of measurement
Quantity METRIC and CUSTOMARY/
STANDARD
Length meter inch, yard, foot, mile
Volume liter gallon, quart, pint, hogshead
Mass/Weight gram pound, ounce
Temperature Celsius Fahrenheit

8. +
Systems of Measurement
 Ifyou notice, there are a lot of words for
each customary/standard measurement.
 The world is turning to all metric and soon
these will be the only ones we need!
Quantity METRIC and CUSTOMARY/
STANDARD
Length meter inch, yard, foot, mile
Volume liter gallon, quart, pint, hogshead
Mass/Weight gram pound, ounce
Temperature Celsius Fahrenheit

9. +
Systems of Measurement
 But
how does the metric system work if they
use so many less words than we do??
Quantity METRIC and CUSTOMARY/
STANDARD
Length meter inch, yard, foot, mile
Volume liter gallon, quart, pint, hogshead
Mass/Weight gram pound, ounce
Temperature Celsius Fahrenheit

10. +
Systems of Measurement
 Because they use prefixes to explain
smaller and larger units!! Such as:
milli, centi, deci, kilo
Quantity METRIC and CUSTOMARY/
STANDARD
Length meter inch, yard, foot, mile
Volume liter gallon, quart, pint, hogshead
Mass/Weight gram pound, ounce
Temperature Celsius Fahrenheit

11. +
Systems of Measurement
 Prefixes for Metric System
SMALLER BIGGER
milli (1/1000) ,centi (1/100), deci (1/10), kilo (1000)
Quantity METRIC and CUSTOMARY/
STANDARD
Length meter inch, yard, foot, mile
Volume liter gallon, quart, pint, hogshead
Mass/Weight gram pound, ounce
Temperature Celsius Fahrenheit

13. +
Systems of Measurement
 Fun side note: This is the ipod nano
j N Nano- is another funny
metric prefix.
Nano- 10-9
j
1
Billionth …
REALLY tiny !
TINY

14. +
Review of Proportions
 Proportion: 2 ratios that are equal to each other
ex) 2:6 :: 3: 9 aka 2 =3
6 9

15. +
Review of Proportions
 Proportion: 2 ratios that are equal to each other
ex) 2:6 :: 3: 9 aka 2 =3
6 9