Transcript Diana - ciese

MATRIX GRANT PROJECT

DIANA

ROOM 606

SCHOOL#14
PROPORTIONS
PROPORTIONS & SIMILAR
FIGURES
PROPORTIONS
Define the word proportion
PROPORTIONS
A proportion is an equation which
states that two ratios are equivalent.
Proportions are used to find unknown
lengths
Proportions
Step1:
Write a proportion
stating the lengths
of the figures. Make
sure the lengths
from one figure are
across from each
other.
Example:
If the ring finger is
3ft. tall and 2ft
wide, and the pinky
is 2ft tall and 1ft
wide the proportion
will look like this :
3/2=2/1
MULTIPLY
Step 2
Next you have to cross
multiply. You only
cross multiply if you
have two numbers
diagonal from each
other.
Example:
3/5* n/15
The number three is
diagonal from the
number 15 so you
have to multiply these
two numbers and get
your product.
Step3:
Example:
After you have got
your product, you
must write an
equation stating your
unknown length and
the number you know,
an equal sign, and
your product
5n=45
Divide
Step 4:
Now that you have
wrote your equation,
you have to divide
your product with the
length you do know
Example:
45 ÷5=9
n=9
Solve
Now that you know how to solve proportions
with similar figures solve this:
A triangles height is 6ft and its shadow is 5ft
and another triangle’s shadow is 3 ft, but the
height is unknown. Using a proportion to find
the length.
Website
Now you could go on a educational website. Go
to the internet. Then scroll down and click on
Stevens Institute Matrix. After on the side it has
some sites, click on program resources. Next a
window is going to appear, and you are going to
click where it says 6th grade Harcourt Math.
Then scroll down to chapters 24-27. In that
category scroll down, and click on Exploring
Fractions