Question

Robin has 180 stickers . How many pages of 10 stickers does she need so that she will have 200 stickers in all?

Answer 1

Robin will need 20 pages of 10 stickers each.  Dividing up the 180 stickers she already has into equal amounts of ten on individual pages, will add her up to 18 pages of stickers.  She will need 20 more stickers to accumulate a total of 200: aka: 20 pages of stickers filled with ten each.