Not sure how to teach rounding? I have a surefire solution! Attached is just what you need. There are 32 number cards to round to the nearest 10 with a hands on activity. Students will actually make a "street" that their little pig will walk on. Bulletin board pieces are attached, as well as an answer key, song to sing and student page.
This product is a part of my complete Instant Math Bundle. The Instant Math Bundle contains 42 Instant Math acvitities.
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I highly suggest my 2nd Grade Winter Common Core Pack!
My Common Core ELA Activities will save you lots of time!