2) Calculate multiplication of number which makes sum of units digits 10
Example: 43 x 47
The answer is 2021 i.e., 4 x 5(next number to 4) =20 for first two digits and multiplication of unit digits i.e., 3 x 7= 21
The above 'rule' works when you multiply 2 numbers with units digits add up
to 10.
Example: 43 x 47
The answer is 2021 i.e., 4 x 5(next number to 4) =20 for first two digits and multiplication of unit digits i.e., 3 x 7= 21
The above 'rule' works when you multiply 2 numbers with units digits add up
to 10.
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