Attachments
Rates and Proportions Vocabulary.doc
Rates, Ratios, and ProportionsVOCABULARY
Word
Definition
Example
1
Congruent
Same size and shape; corresponding sides and angles are
equal
(Symbol:
)
@
4
1
1
4
1
5
1
5
=
·
=
·
EMBED Equation.3
DEF
ABC
D
@
D
2
Convert (conversion)
To change from one form to another
Time conversion: 1 minute = 60 seconds
Length conversion: 12 inches = 1 foot
3
Corresponding
In similar figures, parts that in the same location and are in
proportion
SA corresponds to MO
OR corresponds to AL
4
Cross multiplying
One method to prove proportions are equal
15
10
9
6
=
90
90
10
9
15
6
=
·
=
·
5
Customary system
A system of measurement in the U.S.
Length: inch, foot, yard mile
Capacity: ounce, cup, pint, quart, gallon
Weight: ounce, pound, ton
6
Equivalent rates
Rates that have the same value (are equal)
min
1
5720
1
65
feet
hour
miles
=
4
1
1
4
1
5
1
5
=
·
=
·
Because
mile
feet
hour
hour
miles
1
5280
min
60
1
1
65
·
·
7
Equivalent ratios
Ratios that have the same value (are equal)
24
15
8
5
and
are equivalent ratios because both ratios equal 0.625
8
Formula
A mathematical statement or rule
Convert 40 degrees Celsius to degrees Fahrenheit using the
formula
32
5
9
+
=
C
F
:
F
F
0
104
32
)
40
(
5
9
=
+
=
9
Indirect measurement
A technique that uses proportions to find a measurement when
direct measurement is not possible
On a map, 1 inch = 25 miles. If a distance between two cities is
8 inches, how many miles is it?
miles
inches
miles
inch
?
8
25
1
=
miles
x
miles
x
200
8
25
=
·
=
10
Metric
A system of measurement based on tens
Kilo- Hecto- Deka- (base) Deci- Centi- Milli-
Base units
Capacity: liter
Length: meter
Mass: gram
11
Multiplicative Identity Property
Any number multiplied by one will always give a product of the
original number (the number keeps its identity)
12
Percent
A ratio meaning “out of 100” (Symbol: %)
%
40
100
40
=
%
75
100
75
20
15
=
=
13
Polygon
A closed figure formed from line segments that meet only at
their endpoints
Examples Non-Examples
14
Proportion
An equation that states that two terms are equal
18
15
6
5
=
a
a
b
a
13
5
52
20
=
15
Rate
A fixed ratio between two things
Cell phone plan: 8 cents/minute
Bag of candy: $1.49/lb
16
Ratio
A comparison of two numbers; can be written in words, as a
fraction, or with a colon
There are 3 boys and 4 girls in the class. What is the ratio of
boys to girls?
Words 3 to 4
Fraction
4
3
Colon 3:4
17
Similar
Figures that are the same shape but not necessarily the same
size
(Symbol: ~)
18
Standard system
Another name for the customary system
Length: inch, foot, yard mile
Capacity: ounce, cup, pint, quart, gallon
Weight: ounce, pound, ton
19
Unit Analysis
The mathematical process used to convert from one measurement to
another
Convert 25 miles per hour to feet per second
sec
1
3
2
36
sec
3600
1
1
5280
1
25
feet
hour
mile
feet
hour
miles
=
·
·
20
Unit Rate
A rate that has a denominator of one unit
Apples cost
lbs
1
79
.
0
$
Speed limit is
hour
miles
1
65
� EMBED Equation.3 ���
_1251829081.unknown
_1251874367.unknown
_1251874533.unknown
_1251875575.unknown
_1251875576.unknown
_1251875574.unknown
_1251874507.unknown
_1251830037.unknown
_1251830358.unknown
_1251874255.unknown
_1251830314.unknown
_1251830026.unknown
_1251829635.unknown
_1251797243.unknown
_1251829043.unknown
_1251829044.unknown
_1251828618.unknown
_1251796731.unknown
_1251796994.unknown
_1251796608.unknown
_1251796641.unknown
_1251796391.unknown
SMART Notebook
Page 1Page 2Page 3Page 4Page 5Page 6Page 7Attachments Page 1
