Question

logarithm method
log0.002154

Answer 1

0.002154 = 2154 / 10⁶
              = 2 * 3 * 359 /10⁶ 

$Log_{10}\ 0.002154=Log_{10}\ \frac{(2 \times 3 \times 359) }{10^6}\\\\=Log_{10}\ 2\ +Log_{10}\ 3\ +\ Log_{10}\ 359\ -6$

    =  0.03010 + 0.4771 + 2.5551 - 6   = -2.6667

Answer 2

it is the logrithim                -2.6667