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Estimation
Mathematics, Grade 5
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Study Guide Estimation Mathematics, Grade 5
❮
1
/
2
❯
ESTIMATION
Estimation
is
an
approximate
calculation.
Some
uses
of
rounding
are:
•
Checking
to
see
if
you
have
enough
money
to
buy
what
you
want.
•
Getting
a
rough
idea
of
the
correct
answer
to
a
problem
How
to
Estimate:
A
quick
way
to
estimate
the
sum
of
two
numbers
is
to
round
each
number
and
then
add
the
rounded
numbers.
This
probably
won't
be
the
exact
answer
but
it
may
be
close
enough
for
some
purposes.
How
to
estimate
a
sum
by
rounding:
•
Round
each
term
that
will
be
added
•
Add
the
rounded
numbers
•
An
estimate
can
sometimes
be
improved.
If
the
sum
of
345
+
440
were
estimated,
we
would
round
345
to
300
and
440
to
400.
The
estimate
would
be
300
+
400
or
700.
Both
numbers
were
rounded
down.
The
number
345
was
rounded
down
by
45
and
440
was
rounded
down
by
40.
Adding
45
+
40
gives
85,
which
rounds
to
100.
Therefore,
a
better
estimate
would
be
800.
The
actual
sum
is
785.
How
to
improve
the
estimate:
Round
each
term
that
will
be
added
Add
the
rounded
numbers
If
both
are
rounded
down
or
both
rounded
up
see
if
the
amount
of
rounding
is
more
than
50.
If
it
is,
add
or
subtract
100
to
the
estimate.
If
one
number
is
rounded
down
and
the
other
is
rounded
up
a
closer
estimate
will
not
be
produced
by
this
method.
Example:
Estimate
the
sum
of
the
following
group
of
numbers:
125,
333,
216
round
each
term:
100,
300,
200
add
the
numbers:
100
+
300
+
200
=
600
© Copyright NewPath Learning. All Rights Reserved.
Permission
is
granted
for
the
purchaser
to
print
copies
for
non-commercial
educational
purposes
only.
Visit
us
at
www.NewPathLearning.com.
Try
This!
Estimate
the
sum
of
the
following
group
of
numbers:
459,
780,
551
Estimate
the
sum
of
the
following
group
of
numbers:
$3.29,
$1.11,
$7.32
© Copyright NewPath Learning. All Rights Reserved.
Permission
is
granted
for
the
purchaser
to
print
copies
for
non-commercial
educational
purposes
only.
Visit
us
at
www.NewPathLearning.com.
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