Place Value Cups. Use the cups to understand place value practice counting forward and backward learn the names of large numbers decompose numbers to expanded form. I would either label the cups 'ones' 'tens' etc. or add a comma cup or decimal point cup
Grammar: the difference between knowing your shit and knowing you're shit. I apologize for the vulgarity, but sometimes it is necessary to prove a point. This flip chart will be in any room of which I am a part.