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Estimation
Mathematics, Grade 3
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Study Guide Estimation Mathematics, Grade 3
❮
1
/
2
❯
ESTIMATION
What
Is
Estimation?
When
you
make
an
estimate,
you
are
making
a
guess
that
is
approximate.
This
is
often
done
by
rounding.
How
to
Estimate:
•
When
estimating,
you
will
often
need
to
round
off
the
numbers
with
which
you
are
working.
For
example:
There
are
148
gumballs
in
three
jars.
If
the
jars
have
about
the
same
amount,
estimate
how
many
gumballs
are
in
each
jar?
To
solve
this
problem:
o
First
round
148
to
150.
150
is
an
easier
number
to
work
with
when
estimating.
o
Now
take
150
and
divide
it
into
three
parts.
Since
50
+
50
+
50
=
150,
then
there
are
approximately
50
gumballs
in
each
jar.
•
When
estimating
to
add
or
subtract,
round
each
number
before
adding
or
subtracting.
For
example:
To
estimate
the
sum
of
23
and
17:
o
First
round
23
and
17
to
the
nearest
ten.
23
rounded
to
the
nearest
ten
is
20
17
rounded
to
the
nearest
ten
is
20
o
Then
add
20
and
20
together.
20
+
20
=
40
To
estimate
the
difference
between
32
and
14:
o
First
round
32
and
14
to
the
nearest
ten.
32
to
the
nearest
ten
is
30
14
to
the
nearest
ten
is
10
o
Then
subtract
10
from
30.
30
–
10
=
20
© 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.
24
+
37
=
______
62
+
19
=______
31
+
46
=
______
18
+
48
=______
Estimate
the
difference
of
the
following.
48
–
31
=
______
52
–
29
=
______
88
–
53
=
______
76
–
20
=
______
© 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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