Lesson 4.6:
2-Digit Addition: How do you record the steps when adding 2-digit numbers?
2-Digit Addition: How do you record the steps when adding 2-digit numbers?
2.NBT.5 Fluently add and subtract within 100 using strategies based on place value, properties of operations, and/or the relationship between addition and subtraction.
2.NBT.9 Explain why addition and subtraction strategies work, using place value and the properties of operations.