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Byju's Answer
Standard VII
Mathematics
Perfect Square Numbers
Determine the...
Question
Determine the square value of
813
using direct multiplication method.
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Solution
We can write
813
2
=
(
800
+
13
)
2
Using
(
a
+
b
)
2
=
a
(
a
+
b
)
+
b
(
a
+
b
)
Here
a
=
800
,
b
=
13
Therefore,
813
2
=
800
(
800
+
13
)
+
13
(
800
+
13
)
=
800
2
+
10400
+
10400
+
13
2
=
640000
+
20800
+
169
=
660969
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