This is a set of three math activites that are aligned with the third grade core curriculum- 3.NBT.1. There is a whole class rounding activity in which students search to find their rounding partner who has the matching card. When they find the correct partners they will have two cards with a Halloween riddle and its answer. The other activites can be done as center activites or as a group activity. One is a greater than/less than activity using witch's hats as the symbol.The other is a candy corn activity that involves matching numbers in their standard form, expanded form and written form.