Question:

A new colony was built and the builder gave a contract to a sign maker to number the buildings from number 1 to 500.

How many zeroes will he need?

Answer: Please Provide your opinion in comments section below.

10-90,110-190,210-290,310-390,410-490 : 9 in each =9×5= 45 zeros

101-109,201-209,301-309,401-409 = 9 in each = 9×4=36 zeros

100,200,300,400,500 = 10 zeros

So total Zero’s = 45+36+10 =91