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Estimation
Mathematics, Grade 6
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Study Guide Estimation Mathematics, Grade 6
ESTIMATION
Estimation
is
the
process
of
rounding
a
number
either
up
or
down
to
the
nearest
place
value
requested.
Estimation
makes
it
easier
to
perform
mathematical
operations
quickly.
How
to
use
estimation:
•
The
rule
for
estimating
numbers
is
based
on
what
place
value
the
number
is
to
be
rounded.
Once
it
is
determined
what
place
value
a
number
is
to
be
rounded,
look
at
the
number
to
the
right
of
the
place
value.
If
this
number
is
5
or
higher,
round
up.
If
this
number
is
4
or
below,
round
down.
Example:
Round
352
to
the
nearest
hundred
→
352
Check
number
to
the
right
of
hundreds
place
→
5
→
round
up
→400
•
If
you
are
estimating
when
place
value
is
not
stated,
round
to
the
nearest
ten
if
it
is
a
two
digit
number,
nearest
hundred
if
a
three
digit
number
etc.
When
estimating
cost,
the
cost
is
usually
rounded
to
the
nearest
whole
dollar.
•
Estimating
can
be
done
with
word
problems
like
commission,
and
also
with
finding
the
area,
perimeter
and
circumference.
Try
this!
1.
Estimate
464
to
the
nearest
hundred.
2.
Estimate
18%
of
200.
3.
Estimate
the
cost
of
two
items
that
cost
$1.83
each.
4.
Estimate
the
area
of
a
rectangle
with
a
length
of
54
and
a
width
of
23.
5.
Estimate
how
many
pencils
22
children
would
get
if
there
were
239
pencils
in
all.
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