Unit 4
Games:
2.NBT.5 Fluently add and subtract within 100 using various strategies.
2.NBT.6 Add and subtract up to four two-digit numbers using various strategies.
2. NBT.7 Add and subtract within 1000 using concrete models or drawings and various strategies.
2. NBT. 8 Mentally add/subtract 10 or 100 to and from numbers between 100-900.
2.NBT.9 Explain why addition and subtraction strategies work, using place value and the properties of operations.