Many of my second grade students are great by counting by 10's; if it counting on the decades. According to CCSS second graders need to add within 100 using mental stragegies. So counting by 10's off the decade is something we have been practicing.
If your students need the same practice then this is a fun whole game to get students practicing.
This would work great for 2nd grade, but also could work for 1st and 3rd depending on your student needs.
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