Robbie and Greyson are decorating the Christmas tree! Robbie put up nine green balls and Greyson put up some red ones. There were 20 balls in all on the tree. How many did Greyson put on? Draw your thinking and show the number sentence!
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Robbie and Greyson are decorating the Christmas tree! Robbie put up nine green balls and Greyson put up some red ones. There were 20 balls in all on the tree. How many did Greyson put on? Draw your thinking and show the number sentence!
