Can you help answer a question that we have about adding two-digit numbers? We were discussing if this standard means that first graders should only add a two-digit and a one-digit number or a two-digit number and a multiple of ten or if they should also be introduced to adding two 2-digit numbers neither of which are multiples of ten. The end of the standard seemed to suggest that they maybe should be introduced to the later and the example in the progression shows a problem with two 2-digit numbers. We all understand that we are not expecting first graders to use the standard algorithm but rather math tools, pictures, etc to find the sum. We are just unsure about what type of numbers the standard calls for our students to add.
Thank you for your help