Grouping through friendly numbers builds greater mental number sense. These 50 page digital slides will project colored shapes, that students will mentally calculate, then calling out the number that they see. Students will learn to group by twos, threes, fours when possible and the friendly fives and tens as they can. Subitizing patterns in life opens the world to mathematical number sense strength. Seeing arrays, patterns, ad grouping colors will challenge speeds to increase through this mental activity of subitizing. If you have not started this method of visual grouping, get started today! It's simple and no paper will be needed, just project the slides you want and talk about how the students see the numbers in the patterns. I like to vary the challenge by teams, individual students, or class drills to pass through the slides as fast as possible. Get subitizing!