-
Question
SCREEN[1]
Multiply 20 by 7
or
If one bag has 20 mangoes,
Then total how many mangoes are there in 7 bags
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Step : 1
SCREEN[2]
Number 1 = 20
Number 2 = 7
Multiplying 20 by 7 means
adding (10 + 10), 7 times
10 10
+ 10 10
+ 10 10
+ 10 10
+ 10 10
+ 10 10
+ 10 10
--------------------------------------------------------------------------
= 70 70
Total = 70 + 70
Result = 140
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Step : 2
SCREEN[3]
Number 1 = 20
Number 2 = 7
20
x 7
=
(10 + 10)
x 7
(70 + 70)
140
Result = 140
-
Step : 3
SCREEN[4]
+ 10 10
+ 10 10
+ 10 10
+ 10 10
+ 10 10
+ 10 10
+ 10 10
--------------------------------
=
+ 2 groups of 10
+ 2 groups of 10
+ 2 groups of 10
+ 2 groups of 10
+ 2 groups of 10
+ 2 groups of 10
+ 2 groups of 10
--------------------------------
= 14 groups of 10 = 140
-
Step : 4
SCREEN[5]
20
x 7
-----------
= 2 groups of 10
x 7
--------------------
= 14 groups of 10
= 140
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Step : 5
SCREEN[6]
Observe that number of groups of 10
become double of number of groups of 20.
We can easily do this multiplication by
counting total number of groups of ten
after breaking the numbers in groups of tens
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