Give your class the free pH module

Each student can start with a short check of at most 16 questions; answering all 16 takes about 6 to 8 minutes. Then every student works through all six short lessons, about 25 to 35 minutes in all, and can stop after any lesson and pick up there later. We ask less often in review about what a student showed on the check.

After the lessons, a student can work an exam-style cluster: a few questions about one set of data, then a written answer, about 10 to 15 minutes. The first review asks up to 10 questions unless a student chooses to keep going. On later days, we bring back up to 20 questions when due. Answering 20 takes about 8 to 10 minutes.

A student finishes the module by working one cluster and answering each of the 21 questions right on later days. A question we count as known because a student answered it right on the check takes one later day. One we count as known from right answers to questions that build on it takes three later days, because we inferred it from those answers rather than from an answer to it. Any other question takes two later days.

Students use it without signing up, and we ask for two optional things: permission to keep research notes on how each student works through the lessons, which we use only to make the lessons better, and, after the check or the first lesson, an email address for a link that opens the same progress in another browser that has none of its own. We use the address only to send that link, and we delete it from our records within two days.

Post this link wherever your class finds its assignments.

Some schools block any site their filter company hasn’t categorized yet. Before you assign the module, open the link on a school computer. If it doesn’t open, ask your school’s technology team to allow periodicmole.com.

You won’t see your students’ answers or progress. There’s no roster, no class code, no teacher account, and nothing for you or your school to sign.