Select a standard
2.NBT.B.5
Fluently add and subtract within 100 using strategies based on place value, properties of...
2.NBT.B.6
Add up to four two-digit numbers using strategies based on place value and properties of...
2.NBT.B.7
Add and subtract within 1000, using concrete models or drawings and strategies based on place...
2.NBT.B.8
Mentally add 10 or 100 to a given number 100–900, and mentally subtract 10 or 100 from a...
2.NBT.B.9
Explain why addition and subtraction strategies work, using place value and the properties of...