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Basic Math Examples
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Basic Math
Estimate 656-521
656
−
521
656
-
521
Step 1
Round
656
656
to
650
650
.
650
−
521
650
-
521
Step 2
Round
−
521
-
521
to
−
500
-
500
.
650
−
500
650
-
500
Step 3
Subtract
500
500
from
650
650
.
150
150
Step 4
The
approximate
value of
656
−
521
656
-
521
found by front end estimation.
656
−
521
≈
150
656
-
521
≈
150
6
5
6
−
5
2
1
6
5
6
-
5
2
1
(
(
)
)
|
|
[
[
]
]
√
√
≥
≥
π
π
7
7
8
8
9
9
≤
≤
4
4
5
5
6
6
/
/
^
^
×
×
>
>
!
!
1
1
2
2
3
3
-
-
+
+
÷
÷
<
<
,
,
0
0
.
.
%
%
=
=
⎡
⎢
⎣
x
2
1
2
√
π
∫
x
d
x
⎤
⎥
⎦
[
x
2
1
2
π
∫
x
d
x
]
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