Common Core: Be Wise-Subitize, Developing Instant Recognition of Quantities. The ability to subitize, or instantly recognize small arrangements of items, is a foundational math skill. A few minutes of highly engaging practice each day is all it takes to develop this skill. This group of cards includes dice patterns, tally marks, hearts, and finger patterns. Includes instructions for how to use the cards in the classroom. Great for whole group or small group instruction. $
Math Coach's Corner: Using Ten-Frames to Build Number Relationships. “The most common and perhaps most important model for this relationship [relating given numbers to other numbers] is the ten-frame.”
McGraw Hill Education has an online interactive “Math Toolbox” (as I like to call it). You can select your grade level (PreK-8) and then there are various game boards, story boards and workmats. There are also various manipulatives to use!