Math activity for Doubles and Doubles plus one. GO PAPERLESS with this Doubles and Doubles Plus One PowerPoint for Kindergarten math and First Grade math. This digital activity for Autumn and Halloween will help students learn their doubles plus 1 math facts and practice mental math strategies. You get 22 slides for a DRAG and DROP math addition activity during the fall season. Pumpkins for manipulatives are on the left side of the screen for differentiation and numbers are on the right side o