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Parin Sir > sir
27
May
Multiplication By Short Cut-Methods
Multiplication of a Number By 99, 999, 9999 etc. : Place as many zeros to the right of the multiplicand as is the number of nines and from the number so formed, subtract the multiplicand to get the answer.
e.g. Multiplyi…
27
May
Tests for Divisibility
Divisible by 2n : If last n digits of a number is divisible by 2n, the whole number is divisible by 2n.
Divisible by 2 : A number is divis…
26
May
26
May
Fundamental (Numbers)
Relatively Prime ( Co-Prime ) : Two positive integers are said to be relatively prime to each other if their highest common factor ( H.C.F. ) is 1.
(a, b) = H.C.F. of a and b & [a, b] = L.C.M. of a …
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