Number+&+Operations+in+Base+Ten

= 4.NBT.1 = = = = =

= 4.NBT.2 = = = = =

= 4.NBT.3 = = = = =

= 4.NBT.4 = = = = =

= 4.NBT.5 = = = media type="youtube" key="iDXH9tfVqAI" height="315" width="420"