An oldie but beloved! The children adore this activity and never realize they are being assessed!  Woot!
pattern-necklace
I begin by placing three different color of beads on each table.  I tell the children they are making an AB pattern necklace and can only use two colors.
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I put small paper plates on the table for each child to gather the needed beads.
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If I see a child is selecting three colors – I note it and then talk to them about AB patterns.  I do not go further than one intervention.
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I always tape down the necklace string.  I used a string I found at JoAnn Fabrics that was stretchy.
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Here is a good photo of a group at work.
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The children loved their finished necklaces!  So proud!
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Yes, a classic but never too old to be just the right thing. . .