Simple operation 99 ^ 2-1

Simple operation 99 ^ 2-1


99^2-1
=(99+1)(99-1)
=100x98
=9800
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How to calculate 2 * 999 + 4 * 99 + 3 * 9 + 4 + 5 in a simple way


2*999+4*99+3*9+4+5
=2*(1000-1)+4*(100-1)+27+9
=2000+400-2+36
=2434



How to simplify the operation of 3.12 + 3.12 * 99


=3.12+3.12*99
=3.12x(1+99)
=3.12x100
=312