Necklace is being made with beads that are each 1.25 cm in a diameter the necklace is 30 cm long each bead costs $0.15 how much will be spent on the necklace

You divide 30 by 1.25, because you are trying to find out the number of beads. You get 24. You multiply 24 and 0.15 You get 3.6 When you are clucking money, you have to make there there is something in the hundredth place, so you add a zero. The necklace costs $3.60