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Byju's Answer
Standard V
Mathematics
Three-Digit Box Multiplication
While mulitpl...
Question
While mulitplying
256
×
196
by box method, find the missing numbers in the below box.
A
A
=
1
,
200
; B
=
540
and C
=
36
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B
A
=
1
,
200
; B
=
4
,
500
and C
=
300
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C
A
=
1
,
200
; B
=
4
,
500
and C
=
36
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D
None of the above
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Solution
The correct option is
C
A
=
1
,
200
; B
=
4
,
500
and C
=
36
To multiply two numbers using the box method, we must first express them in expanded form.
∴
Numbers in expanded form are:
256
=
200
+
50
+
6
and
196
=
100
+
90
+
6
Now,
256
×
196
=
(
200
+
50
+
6
)
×
(
100
+
90
+
6
)
Since, both the numbers are of three digits, we need
3
×
3
box as depicted in figure below,
now, multiplying numbers on left of box by numbers on top of box one by one as shown in below figure,
Therefore, comparing this box with the given box,
A
=
1
,
200
; B
=
4
,
500
and C
=
36
.
∴
(c) is the correct option.
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