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This year, Jackie Xuereb is teaching her sixth grade math students how to add and subtract fractions with unlike denominators. But next year, new standards will call for students to know that information before they enter her class.

Xuereb, a sixth grade math teacher at Washington Heights Expeditionary Learning School, is among the city math teachers preparing to swap the state’s learning standards for the Common Core this fall. And like many, she is struggling to keep the two sets of standards straight as the new standards move some topics an entire grade-level earlier than in the past.

“A lot of what used to be sixth grade standards are now taught in fifth grade,” Xuereb said. “I feel that I’m going to have to be really mindful and cognizant of this in my planning for next year. The kids are going to have these huge gaps.”

New York City piloted the Common Core standards in 100 schools last year and asked all teachers to practice working with them this year. Next year, every teacher in every elementary and middle school will be expected to teach to the new standards, and state tests will be based on them. Department of Education officials have argued that a full-steam-ahead approach is required because moving slowly would deprive students of the Common Core’s long-overdue rigor.

But some say that this approach will pose a special challenge for math teachers, particularly in the middle school years, as students begin learning advanced concepts that build on each other sequentially. William Schmidt, an education professor at Michigan State University who has researched the effect of the Common Core on learning, said students who miss a lesson the first time around are at risk of missing the concept entirely.

“If it’s done really carefully it might work, but that would be my worry, that this would require fairly careful thought about how to do that across the grades so that what’s happening in one grade will line up with the next,” he said. ”If they’re not ramping this up from first grade on in a logical fashion … then the transition to more advanced math will be horrendous, too.” (more…)