Transcript Grade 5 Big Idea 2 - ElementaryMathematics

GROWING A
FACTOR TREE
Or
Or
Can
think
You
might
Youyou
might
You
might
of
one
notice
that
notice that 180
180
see
180
FACTOR
Can
we
has
a
ZERO
in
has
athat
ZERO
in
PAIR
for
180
isits
anONES
EVEN
its
ONES
grow
a ?
PLACE
which
NUMBER
PLACE
which
tree
of
means
itit is
means
is a
a
and that
the
This
should
be
multiple
of
10.
multiple
of
10.
means that
two
numbers
factors
SO…
is a
SO…
that2
multiply
of
180?
10
x
•
10
x
•=
= 180
180
factor…
together
to
give the
2 x •= 180 ?
Product
10
x 18 =180.
180
180
10
18
180
NOW
You have
to find
FACTOR
PAIRS
for
10
and
18
10
18
We “grow” this
“tree” downwards
since that is how
we write in English
(and we are not
sure how big it will
be. We could run
out of paper if we
grew upwards).
180
Find factors
for 10 & 18
18
10
2 x 5 = 10
2
5
6
3
6x3=
18
Since
2ARE
and 3
and 5 are
PRIME
WE
NUMBERS
they do not
DONE
grow “new
branches”.
???
They
just
grow down
alone.
180
Since 6 is NOT a
prime number - it is
a COMPOSITE
NUMBER - it still
has factors. Since it
is an EVEN
NUMBER we see
that:
18
10
6=2x•
2
2
5
6
3
5 2 3 3
FCAT 2.0
Sample
Test
Question
Answer: C
FCAT 2.0
Test Spec.
Item
MA.5.A.6.1
Identify and relate prime and composite
numbers, factors and multiples within the
context of fractions.