Abstract

If you want to count trailing zeros of an integer, you have many options. Some are (curly brackets indicate that you need to enter the formula with CTRL + SHIFT + ENTER):

{=(A3<>0)*SUM(--(A3=ROUND(A3,-ROW(INDIRECT("1:15")))))}
{=LEN(ABS(A4))-LEN(SUM(MID(ABS(A4),LEN(ABS(A4))+1-ROW(INDIRECT("1:"&LEN(ABS(A4)))),1)*10^(LEN(ABS(A4))-ROW(INDIRECT("1:"&LEN(ABS(A4)))))))}
=6+RIGHT(TEXT(ABS(A5),"0.##############E+00"),2)-LEN(TEXT(ABS(A5),"0.##############E+00"))
=(A6<>0)*(LEN(ABS(A6))-LEN(--("0."&ABS(A6)))+2)

Count_Trailing_Zeros_Example2

The formula in B4 would have been my favourite one if Excel had a worksheet function REVERSE. Then we could just say

=LEN(ABS(A1))-LEN(--REVERSE(ABS(A1)))