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Find percent notation for 0.008 0.008=

Mrs. morton has a special reward system for her class. when all her students behave well, she rewards them by putting 3 marbles into a marble jar. when the jar has 100 or more marbles, the students have a party. right now, the the jar has 24 marbles. how could mrs. morton reward the class in order for the students to have a party?

45 was divided by a power of ten to get 4.5. what power of ten was it divided by? people 4.5