Question

A store has a contest to guess the mass of 10,000 peanuts.if a peanut has a mass of about 0.45 gram,what would be a reasonable guess for the mass of 10,000 peanuts?

Answer 1

Move the decimal point in 0.45  4 places to the right inserting zeroes where necessary

This gives  4,500 g  = 4.5 kgs.