Dear frnds
Multiplication is when we use some tricks with mental calculations.
Today we understand how 
Multiplication is when we use some tricks with mental calculations.
Today we understand how
Multiplying by a two digit no. which last digit 9 and 1
ie. 19,29,39,——-89,99.
& 11,21,31,41,—-81,91.
Take a example 7653 × 19
How calculate in one line…
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