addition strategies
Making Tens
Students break numbers apart to make tens.
https://youtu.be/6PA8t76aMQE
landmark / friendly numbers
Students adjust one or both addends to make numbers that are easier and friendlier to use.
https://youtu.be/10nnAvLjbN8
place value
Students break apart each addend according to place value and combine quantities. Students may start combining from the highest value to lowest or lowest to highest value.
https://youtu.be/7vrcTt9saPs
compensation
Student manipulate the numbers into easier, friendlier numbers by removing a specific amount from one addend and adding it to the other addend.
https://youtu.be/cfAc2xF4cAg
adding in chunks
Students keep one addend whole and break one addend into friendlier to use chunks.
https://youtu.be/2QC3ikuRlGc
Expanded Algorithm
Students expanded each number according to place value and add. This ensures place value stays at the forefront of addition and explicitly shows what is occurring throughout the algorithm.
https://youtu.be/AveT7jpI9mU
Expanded algorithm
Students begin to place numbers vertically but continue to explicitly show place value throughout the algorithm.
https://youtu.be/2V3BHi6x7F8
standard algorithm
Students may use the standard algorithm once they have built their understanding of what is taking place in each step.